docs: fix readthedocs build (#3824)

ccmao1130 · web-flow · commit 47fde8a1da43 · 2025-02-18T18:00:05.000-08:00
Mkdocs failing on 
```
ERROR - Required dependencies of "social" plugin not found:
- ModuleNotFoundError("No module named 'cairosvg'")
diff --git a/.gitignore b/.gitignore
@@ -57,3 +57,6 @@ out
 # typescript
 *.tsbuildinfo
 next-env.d.ts
+
+# added by mkdocs social cards
+.cache
diff --git a/docs/mkdocs.yml b/docs/mkdocs.yml
@@ -166,4 +166,7 @@ plugins:
 - mkdocs-simple-hooks:
     hooks:
       on_pre_build: "docs.hooks:make_api_docs"
-- social
+- social:
+    cards_layout_options:
+      background_color: "#532687"
+    cards_dir: social
diff --git a/requirements-docs.txt b/requirements-docs.txt
@@ -16,3 +16,4 @@ mkdocs-material
 mkdocs-macros-plugin
 mkdocs-simple-hooks
 pymdown-extensions
+mkdocs-material[imaging]
