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docs: restructure six bloated pages and add a docs style guide #2004

Job	Run time
Classify verification scope	11s
Lockfile consistency	25s
Wheels	0s
Verify	3s
Compiler golden outputs	0s
Native compiler on Windows	0s
Native compiler on Python ${{ matrix.python }}	0s
Rules performance guards	0s
Formatter performance guards	0s
DuckDB E2E (${{ matrix.name }})	0s
ClickHouse integration and E2E tests	0s
Fresh-process compile cache (${{ matrix.models }} models)	0s
PostgreSQL integration and E2E tests	0s
Same-runner compile ratio (${{ (matrix.label \|\| matrix.kind) }} 3000 models)	0s
Dense all-rules compile (${{ matrix.models }} models)	0s
Fresh-process compile (${{ matrix.models }} models)	0s
Performance guards	0s
Static checks and unit + integration tests	0s
	39s