chore: More rustdoc-specific crates to a separate rustdoc folder #1230

Job	Run time
Build CLIs (linux)	1m 38s
format_docs	7s
build_docs	2m 34s
Lint (linux)	2m 15s
Build CLIs (windows)	3m 50s
build_pxh	32s
Build CLIs (macos)	1m 57s
Example realworld (linux)	1m 57s
Run UI tests (linux)	7m 46s
is_up_to_date	8m 30s
Starter (linux)	1m 46s
Run tests (linux)	56s
Run `pavex` tests (linux)	1m 16s
Tests for `pavex_session_sqlx` (linux)	1m 26s
Tests for `pavex_session_redis` (linux)	54s
Run macro tests (linux)	1m 57s
Run UI tests (macos)	7m 48s
Run tests (macos)	1m 27s
Run `pavex` tests (macos)	1m 37s
Run UI tests (windows)	11m 29s
Run `pavex` tests (windows)	5m 8s
Run tests (windows)	2m 36s
	1h 9m 26s

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