Fix KCC book build

.github/workflows/kcc20-book-pages.yaml

@@ -47,6 +47,9 @@ jobs:
         with:
           tool: mdbook
 
+      - name: Install mdBook Mermaid
+        run: cargo install mdbook-mermaid
+
       - name: Build book
         run: mdbook build docs/kcc20-book
 

README.md

@@ -38,7 +38,7 @@ cargo run -p cli-debugger -- \
 
 ## Documentation
 
-See [TUTORIAL.md](docs/TUTORIAL.md) for a full language and usage tutorial, and [DECL.md](docs/DECL.md) for the covenant declaration spec.
+See [TUTORIAL.md](docs/TUTORIAL.md) for a full language and usage tutorial, [DECL.md](docs/DECL.md) for the covenant declaration spec, and the [KCC20 book](https://kaspanet.github.io/silverscript/kcc20-book/).
 
 ## Credits
 

docs/kcc20-book/README.md

@@ -10,6 +10,12 @@ From the repository root:
 mdbook build docs/kcc20-book
 ```
 
+The book uses Mermaid diagrams, so local builds also need `mdbook-mermaid`:
+
+```bash
+cargo install mdbook-mermaid
+```
+
 The rendered HTML book will be written to:
 
 ```text