Improve type index pages, codegen now knows about doc categories #9589

Job	Run time
cpp-paths-filter	3s
docs-paths-filter	4s
python-paths-filter	5s
rust-paths-filter	5s
web-paths-filter	5s
Checks / Check if running codegen would produce any changes	1m 8s
Checks / Test Python Docs	19s
Checks / Rerun lints	24s
Checks / Spell Check	10s
Checks / Misc formatting	22s
Checks / Check links	7s
Update PR Body / Update PR body	15s
C++ tests	0s
Deploy Landing Preview / Deploy	8s
Python Checks	0s
Build web viewer / Build web viewer	2m 35s
Build rerun_js / Build rerun_js	2m 6s
Minimum Wheel Build / Set Config (linux-x64)	1s
Rust Checks / Rust lints (fmt, check, cranky, tests, doc)	5m 34s
Minimum Wheel Build / Build Wheels (ubuntu-latest-16-cores)	1m 49s
Minimum Wheel Test / Set Config (linux-x64)	1s
Minimum Wheel Test / Test Wheels (ubuntu-latest-16-cores)	2m 38s
Upload Web / Upload web build to google cloud (wasm32 + wasm-bindgen)	8s
Save PR Summary / Create HTML summary for PR	41s
	18m 48s

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