chore(website): migrate to pnpm and enable minimum release age #468

Job	Run time
PR title check	5s
Doc checks / Doc checks / Docs check	1m 7s
Tests / Integration tests (3.14, ubuntu-latest)	2m 18s
Tests / Integration tests (3.11, ubuntu-latest)	2m 21s
Code checks / Lint check / Lint check (3.11)	11s
Code checks / Type check / Type check (3.11)	10s
Code checks / Type check / Type check (3.12)	13s
Code checks / Type check / Type check (3.14)	15s
Code checks / Lint check / Lint check (3.12)	11s
Code checks / Type check / Type check (3.13)	12s
Code checks / Lint check / Lint check (3.14)	9s
Docstrings checks / Docstrings checks	13s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.13)	43s
Code checks / Spell check	4s
Code checks / Lint check / Lint check (3.13)	9s
Tests / Unit tests / Unit tests (windows-latest, 3.12)	1m 11s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.14)	46s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.12)	45s
Tests / Unit tests / Unit tests (windows-latest, 3.13)	1m 8s
Tests / Unit tests / Unit tests (windows-latest, 3.11)	1m 2s
Tests / Unit tests / Unit tests (windows-latest, 3.14)	1m 5s
Code checks / Actions lint check	32s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.11)	41s
	15m 31s

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