docs: add one-liner dependency addition instructions in the documenta… #2048

Job	Run time
setup / Get and cache Dart dependencies	35s
setup / Compile sqlite3 for tests (ubuntu-latest)	6s
setup / Compile sqlite3 for tests (macos-latest)	12s
setup / Compile sqlite3 for tests (windows-latest)	12s
sqlparser	47s
drift_dev	5m 47s
drift package	2m 3s
Documentation	3m 18s
Integration tests for migration tooling	1m 21s
Integration tests	7m 36s
	21m 57s

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