[Doc] Reduce browser memory usage for docs (#3870)

Signed-off-by: David Chen <530634352@qq.com>

mkdocs.yml

@@ -38,13 +38,12 @@ theme:
   features:
     - content.action.edit
     - content.code.copy
-    - navigation.instant
-    - navigation.instant.progress
     - navigation.tracking
     - navigation.tabs
     - navigation.tabs.sticky
     - navigation.sections
     - navigation.indexes
+    - navigation.prune
     - navigation.top
     - search.suggest
     - search.highlight
@@ -56,6 +55,7 @@ theme:
   custom_dir: docs/mkdocs/overrides
 
 hooks:
+  - docs/mkdocs/hooks/search_index.py
   - docs/mkdocs/hooks/generate_api_readme.py
   - docs/mkdocs/hooks/url_schemes.py
   - docs/mkdocs/hooks/generate_examples.py
@@ -117,6 +117,7 @@ plugins:
             separate_signature: true
             show_overloads: true
             signature_crossrefs: true
+            show_source: false
           inventories:
           - https://docs.python.org/3/objects.inv
           - https://typing-extensions.readthedocs.io/en/latest/objects.inv
@@ -167,9 +168,8 @@ extra_css:
   - mkdocs/stylesheets/extra.css
 
 extra_javascript:
+  - mkdocs/javascript/memory.js
   - mkdocs/javascript/mathjax.js
-  - https://unpkg.com/mathjax@3.2.2/es5/tex-mml-chtml.js
-  - https://unpkg.com/mermaid@10/dist/mermaid.min.js
   - mkdocs/javascript/mermaid.js
   - mkdocs/javascript/edit_and_feedback.js
   - mkdocs/javascript/slack_and_forum.js