[Doc] Add Algolia search to docs (#46477)

This PR updates the documentation search engine to use Algolia,
improving search results.

To add support for Algolia, I've

- Added the `sphinx-docsearch==0.0.7` requirement.
- Bumped the current `sphinx` version to `7.3.7`.
- Committed the public Algolia search API key, [in accordance with their
documentation](https://www.algolia.com/doc/guides/security/api-keys/#search-only-api-key).

Signed-off-by: pdmurray <[email protected]>

doc/requirements-doc.txt

@@ -7,7 +7,7 @@ setuptools>=70.0.0
 Pygments==2.16.1
 
 # Sphinx
-sphinx==7.1.2
+sphinx==7.3.7
 sphinx-click==5.1.0
 sphinx-copybutton==0.5.2
 sphinxemoji==0.2.0
@@ -20,6 +20,7 @@ sphinx-autobuild==2024.4.16
 pydata-sphinx-theme==0.14.1
 autodoc_pydantic==2.2.0
 appnope
+sphinx-docsearch==0.0.7
 
 pydantic!=2.0.*,!=2.1.*,!=2.2.*,!=2.3.*,!=2.4.*,<3
 

doc/source/conf.py

@@ -70,8 +70,14 @@
     "sphinx_remove_toctrees",
     "sphinx_design",
     "sphinx.ext.intersphinx",
+    "sphinx_docsearch",
 ]
 
+# Configuration for algolia
+docsearch_app_id = "LBHF0PABBL"
+docsearch_api_key = "6c42f30d9669d8e42f6fc92f44028596"
+docsearch_index_name = "docs-ray"
+
 remove_from_toctrees = [
     "cluster/running-applications/job-submission/doc/*",
     "ray-observability/reference/doc/*",