Remove support for non-HTML doctypes

Related to syntax-tree/hast@2.4.0

Author: wooorm

lib/index.js

@@ -1,7 +1,6 @@
 /**
  * @typedef {import('parse5').Document} P5Document
  * @typedef {import('parse5').DocumentFragment} P5Fragment
- * @typedef {import('parse5').DocumentType} P5Doctype
  * @typedef {import('parse5').Element} P5Element
  * @typedef {import('parse5').Attribute} P5Attribute
  * @typedef {import('parse5').Location} P5Location
@@ -267,16 +266,13 @@ export function raw(tree, file, options) {
    * @returns {void}
    */
   function doctype(node) {
-    /** @type {P5Doctype} */
-    // @ts-ignore it’s a doctype.
-    var p5 = toParse5(node)
     resetTokenizer()
     parser._processToken({
       type: doctypeToken,
-      name: p5.name,
+      name: 'html',
       forceQuirks: false,
-      publicId: p5.publicId,
-      systemId: p5.systemId,
+      publicId: '',
+      systemId: '',
       location: createParse5Location(node)
     })
   }