Search bar stuck on "Searching" on docs site

**What's broken:** Search hangs indefinitely on "Searching."

**Steps to reproduce:** Go to docs.activitywatch.net, type anything in the search bar

**Expected:** Search results should appear

**Root cause:** Sphinx 6+ removed jQuery, but sphinx_rtd_theme depends on it

**Fix:** Adding sphinxcontrib-jquery to dependencies and extensions (PR coming)

**Environment:** Chrome 124, Windows 11

https://github.com/user-attachments/assets/d10be943-6202-45fe-a345-f392648590e9