Add mermaid diagram support for local builds (#162)

Author: JakeSCahill

local-antora-playbook.yml

@@ -39,6 +39,23 @@ antora:
   - require: '@redpanda-data/docs-extensions-and-macros/extensions/add-global-attributes'
   - require: '@redpanda-data/docs-extensions-and-macros/extensions/version-fetcher/set-latest-version'
   - require: '@redpanda-data/docs-extensions-and-macros/extensions/replace-attributes-in-attachments'
+    data:
+      replacements:
+        - components:
+            - 'ROOT'
+            - 'redpanda-labs'
+          file_patterns:
+            - '**/docker-compose.yaml'
+            - '**/docker-compose.yml'
+  - require: '@sntke/antora-mermaid-extension'
+    mermaid_library_url: https://cdn.jsdelivr.net/npm/mermaid@10/dist/mermaid.esm.min.mjs
+    script_stem: mermaid-scripts
+    mermaid_initialize_options:
+      start_on_load: true
+      theme: base
+      theme_variables:
+        line_color: '#e2401b'
+        font_family: Inter, sans-serif
   - require: '@redpanda-data/docs-extensions-and-macros/extensions/validate-attributes'
   - require: '@redpanda-data/docs-extensions-and-macros/extensions/find-related-docs'
   - require: '@redpanda-data/docs-extensions-and-macros/extensions/find-related-labs'