Vendor in Mermaid v10 for frontmatter title support

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

.github/workflows/docs.yml

@@ -93,7 +93,6 @@ jobs:
                   cat SUMMARY.md >> docs/SUMMARY.md
 
                   mv element-web/book.toml .
-                  mdbook-mermaid install .
 
             - name: Build docs
               run: mdbook build

.gitignore

@@ -28,5 +28,4 @@ electron/pub
 /src/modules.ts
 /build_config.yaml
 /book
-/mermaid*
 /index.html

book.toml

@@ -24,3 +24,9 @@ git-repository-url = "https://github.com/vector-im/element-web"
 
 # The path that the docs are hosted on
 site-url = "/element-web/"
+additional-js = ["docs/mermaid/mermaid.min.js", "docs/mermaid/mermaid-init.js"]
+
+[preprocessor]
+
+[preprocessor.mermaid]
+command = "mdbook-mermaid"

docs/mermaid/mermaid-init.js

@@ -0,0 +1 @@
+mermaid.initialize({ startOnLoad:true });