docs: simplify landing page #307

Job	Run time
Build & verify package	43s
Verify dev env (ubuntu-latest)	20s
Verify dev env (windows-latest)	1m 0s
Tests on 3.8	25s
Tests on 3.9	25s
Build docs & run doctests	25s
Type-check package	24s
Tests on 3.10	22s
Type-check API on 3.8	25s
Tests on 3.11	19s
Type-check API on 3.9	31s
Tests on 3.12	31s
Type-check API on 3.10	24s
Type-check API on 3.11	18s
Type-check API on 3.12	28s
Combine & check coverage.	11s
Ensure everything required is passing for branch protection.	2s
	7m 13s

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