docs: add link to official PPE documentation #750

Job	Run time
Type check / Type check (3.11)	22s
Lint check / Lint check (3.10)	10s
Lint check / Lint check (3.11)	9s
Type check / Type check (3.10)	18s
Lint check / Lint check (3.12)	13s
Type check / Type check (3.12)	24s
Unit tests / Unit tests (ubuntu-latest, 3.11)	32s
Unit tests / Unit tests (ubuntu-latest, 3.10)	23s
Lint check / Lint check (3.13)	32s
Type check / Type check (3.13)	21s
Unit tests / Unit tests (ubuntu-latest, 3.12)	23s
Unit tests / Unit tests (ubuntu-latest, 3.13)	21s
Unit tests / Unit tests (windows-latest, 3.10)	58s
Unit tests / Unit tests (windows-latest, 3.12)	2m 12s
Unit tests / Unit tests (windows-latest, 3.11)	42s
Docs check / Docs check	1m 5s
Unit tests / Unit tests (windows-latest, 3.13)	51s
Integration tests / Approve integration tests for PRs from forks	3h 44m 49s
Integration tests / Integration tests	0s
Integration tests / Integration tests for PRs from forks	0s
	3h 54m 45s

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