v2.28.1
General doc updates (#5923)
Cleanup the docs sidebar (#6144)
Remove kenneth's sphinx themes from docs directory
Farewell, sweet Concorde!
Add automatic code formatting to Requests (#6095)
Reword proxies section and add warning
Create .nojekyll
docs cleanup
Update api.rst (#5877)
Fix broken link
Add doc build requirements for RTD (#5956)