docs: update documentation for multi-file codegen and typed controllers #270

Job	Run time
ash-ci / REUSE compliance	12s
ash-ci / Report Mix Dependencies	17s
ash-ci / audit	51s
ash-ci / mix igniter.upgrade	7s
ash-ci / MIX_ENV=test mix.compile	46s
ash-ci / Community Files Check	6s
ash-ci / mix spark.cheat_sheets --check	1m 15s
ash-ci / mix sobelow	37s
ash-ci / mix test	1m 50s
ash-ci / mix deps.unlock --check-unused	38s
ash-ci / mix spark.formatter --check	38s
ash-ci / mix format --check-formatted	41s
ash-ci / mix dialyzer	4m 34s
ash-ci / MIX_ENV=dev mix.compile	29s
ash-ci / mix credo --strict	1m 18s
ash-ci / mix doctor --full --raise	0s
ash-ci / mix ash.codegen --check	0s
ash-ci / mix git_ops.check_message	0s
ash-ci / mix docs	2m 44s
ash-ci / Deploy docs to GitHub pages.	11s
ash-ci / NIF ${{ matrix.nif }} - ${{ matrix.job.target }} (${{ matrix.job.os }})	0s
ash-ci / Release	0s
	17m 14s

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