[DOCS] Regenerate the class diagram in the README

The class diagram is (almost) unchanged to the output
from `tasuku43/mermaid-class-diagram`, except for the
kept `direction LR`.

This is in preparation for adding a script for auto-creating
the class diagram in #1297.

Author: oliverklee

README.md

@@ -727,82 +727,135 @@ classDiagram
         <<abstract>>
     }
 
-    RuleSet <|-- DeclarationBlock: inheritance
-    Renderable <|-- CSSElement: inheritance
-    Renderable <|-- CSSListItem: inheritance
-    Commentable <|-- CSSListItem: inheritance
-    Positionable <|.. RuleSet: realization
-    CSSElement <|.. RuleSet: realization
-    CSSListItem <|.. RuleSet: realization
-    RuleContainer <|.. RuleSet: realization
-    RuleSet <|-- AtRuleSet: inheritance
-    AtRule <|.. AtRuleSet: realization
-    Renderable <|.. Selector: realization
-    Selector <|-- KeyframeSelector: inheritance
+    Anchor ..> ParserState: dependency
     CSSListItem <|-- AtRule: inheritance
-    Positionable <|.. Charset: realization
-    AtRule <|.. Charset: realization
-    Positionable <|.. Import: realization
-    AtRule <|.. Import: realization
-    Positionable <|.. CSSNamespace: realization
-    AtRule <|.. CSSNamespace: realization
-    CSSElement <|.. Rule: realization
-    Positionable <|.. Rule: realization
-    Commentable <|.. Rule: realization
-    SourceException <|-- OutputException: inheritance
-    UnexpectedTokenException <|-- UnexpectedEOFException: inheritance
-    Exception <|-- SourceException: inheritance
-    Positionable <|.. SourceException: realization
-    SourceException <|-- UnexpectedTokenException: inheritance
+    AtRule <|.. AtRuleBlockList: realization
+    CSSBlockList <|-- AtRuleBlockList: inheritance
+    AtRuleBlockList ..> OutputFormat: dependency
+    AtRule <|.. AtRuleSet: realization
+    AtRuleSet ..> OutputFormat: dependency
+    RuleSet <|-- AtRuleSet: inheritance
     CSSList <|-- CSSBlockList: inheritance
-    CSSBlockList <|-- Document: inheritance
+    Renderable <|-- CSSElement: inheritance
+    CSSFunction ..> OutputFormat: dependency
+    CSSFunction ..> ParserState: dependency
+    ValueList <|-- CSSFunction: inheritance
+    CSSList ..> AtRuleBlockList: dependency
+    CSSList ..> AtRuleSet: dependency
     CSSElement <|.. CSSList: realization
-    Positionable <|.. CSSList: realization
     CSSListItem <|.. CSSList: realization
-    CSSList <|-- KeyFrame: inheritance
-    AtRule <|.. KeyFrame: realization
-    CSSBlockList <|-- AtRuleBlockList: inheritance
-    AtRule <|.. AtRuleBlockList: realization
-    CSSFunction <|-- Color: inheritance
-    PrimitiveValue <|-- URL: inheritance
-    RuleValueList <|-- CalcRuleValueList: inheritance
-    Value <|-- ValueList: inheritance
-    CSSFunction <|-- CalcFunction: inheritance
-    ValueList <|-- LineName: inheritance
-    CSSElement <|.. Value: realization
-    Positionable <|.. Value: realization
-    PrimitiveValue <|-- Size: inheritance
-    PrimitiveValue <|-- CSSString: inheritance
-    Value <|-- PrimitiveValue: inheritance
-    ValueList <|-- CSSFunction: inheritance
-    ValueList <|-- RuleValueList: inheritance
-    Renderable <|.. Comment: realization
-    Positionable <|.. Comment: realization
-    %% end of the generated part
-
-
-    Anchor ..> ParserState: dependency
-    CSSList ..> CSSList: dependency
+    CSSList ..> CSSNamespace: dependency
     CSSList ..> Charset: dependency
-    CSSList ..> Comment: dependency
     CSSList ..> Import: dependency
-    CSSList ..> RuleSet: dependency
-    CSSNamespace ..> Comment: dependency
-    Charset ..> Comment: dependency
+    CSSList ..> KeyFrame: dependency
+    CSSList ..> OutputFormat: dependency
+    CSSList ..> ParserState: dependency
+    Positionable <|.. CSSList: realization
+    CSSList ..> Selector: dependency
+    CSSList ..> SourceException: dependency
+    CSSList ..> UnexpectedTokenException: dependency
+    Commentable <|-- CSSListItem: inheritance
+    Renderable <|-- CSSListItem: inheritance
+    AtRule <|.. CSSNamespace: realization
+    CSSNamespace ..> OutputFormat: dependency
+    Positionable <|.. CSSNamespace: realization
+    CSSString ..> OutputFormat: dependency
+    CSSString ..> ParserState: dependency
+    PrimitiveValue <|-- CSSString: inheritance
+    CSSString ..> SourceException: dependency
+    CSSFunction <|-- CalcFunction: inheritance
+    CalcFunction ..> CalcRuleValueList: dependency
+    CalcFunction ..> ParserState: dependency
+    CalcFunction ..> RuleValueList: dependency
+    CalcFunction ..> UnexpectedTokenException: dependency
+    CalcRuleValueList ..> OutputFormat: dependency
+    RuleValueList <|-- CalcRuleValueList: inheritance
+    AtRule <|.. Charset: realization
     Charset ..> CSSString: dependency
+    Charset ..> OutputFormat: dependency
+    Positionable <|.. Charset: realization
+    CSSFunction <|-- Color: inheritance
+    Color ..> OutputFormat: dependency
+    Color ..> ParserState: dependency
+    Color ..> Size: dependency
+    Color ..> UnexpectedTokenException: dependency
+    Comment ..> OutputFormat: dependency
+    Positionable <|.. Comment: realization
+    Renderable <|.. Comment: realization
+    DeclarationBlock ..> KeyframeSelector: dependency
+    DeclarationBlock ..> OutputException: dependency
+    DeclarationBlock ..> OutputFormat: dependency
+    DeclarationBlock ..> ParserState: dependency
+    RuleSet <|-- DeclarationBlock: inheritance
     DeclarationBlock ..> Selector: dependency
-    Import ..> Comment: dependency
-    OutputFormat ..> OutputFormat: dependency
+    DeclarationBlock ..> UnexpectedTokenException: dependency
+    CSSBlockList <|-- Document: inheritance
+    Document ..> OutputFormat: dependency
+    Document ..> ParserState: dependency
+    AtRule <|.. Import: realization
+    Import ..> OutputFormat: dependency
+    Positionable <|.. Import: realization
+    Import ..> URL: dependency
+    AtRule <|.. KeyFrame: realization
+    CSSList <|-- KeyFrame: inheritance
+    KeyFrame ..> OutputFormat: dependency
+    Selector <|-- KeyframeSelector: inheritance
+    LineName ..> OutputFormat: dependency
+    LineName ..> ParserState: dependency
+    ValueList <|-- LineName: inheritance
+    SourceException <|-- OutputException: inheritance
     OutputFormat ..> OutputFormatter: dependency
+    OutputFormatter ..> Commentable: dependency
+    OutputFormatter ..> InvalidArgumentException: dependency
     OutputFormatter ..> OutputFormat: dependency
+    Parser ..> Document: dependency
     Parser ..> ParserState: dependency
+    ParserState ..> Anchor: dependency
+    ParserState ..> Comment: dependency
     ParserState ..> Settings: dependency
-    Rule ..> Comment: dependency
+    ParserState ..> SourceException: dependency
+    ParserState ..> UnexpectedEOFException: dependency
+    ParserState ..> UnexpectedTokenException: dependency
+    Value <|-- PrimitiveValue: inheritance
+    Renderable ..> OutputFormat: dependency
+    CSSElement <|.. Rule: realization
+    Commentable <|.. Rule: realization
+    Rule ..> OutputFormat: dependency
+    Rule ..> ParserState: dependency
+    Positionable <|.. Rule: realization
     Rule ..> RuleValueList: dependency
-    RuleSet ..> Comment: dependency
+    RuleContainer ..> Rule: dependency
+    CSSElement <|.. RuleSet: realization
+    CSSListItem <|.. RuleSet: realization
+    RuleSet ..> OutputFormat: dependency
+    RuleSet ..> ParserState: dependency
+    Positionable <|.. RuleSet: realization
     RuleSet ..> Rule: dependency
+    RuleContainer <|.. RuleSet: realization
+    RuleSet ..> UnexpectedValueException: dependency
+    ValueList <|-- RuleValueList: inheritance
+    Selector ..> OutputFormat: dependency
+    Renderable <|.. Selector: realization
+    Size ..> OutputFormat: dependency
+    Size ..> ParserState: dependency
+    PrimitiveValue <|-- Size: inheritance
+    Exception <|-- SourceException: inheritance
+    Positionable <|.. SourceException: realization
     URL ..> CSSString: dependency
-    ValueList ..> Value: dependency
+    URL ..> OutputFormat: dependency
+    URL ..> ParserState: dependency
+    PrimitiveValue <|-- URL: inheritance
+    UnexpectedTokenException <|-- UnexpectedEOFException: inheritance
+    SourceException <|-- UnexpectedTokenException: inheritance
+    CSSElement <|.. Value: realization
+    Value ..> CSSFunction: dependency
+    Value ..> ParserState: dependency
+    Positionable <|.. Value: realization
+    Value ..> RuleValueList: dependency
+    Value ..> UnexpectedTokenException: dependency
+    ValueList ..> OutputFormat: dependency
+    Value <|-- ValueList: inheritance
+    %% end of the generated part
 ```
 
 ## API and deprecation policy