docs: show mix tasks in docs and update task description #1835

Job	Run time
mix deps.get	14s
mix hex.audit	18s
MIX_ENV=test mix.compile	31s
mix credo --strict	31s
mix git_ops.check_message	29s
mix doctor --full --raise	37s
mix dialyzer	39s
mix format --check-formatted	26s
mix ash_postgres.generate_migrations --check	26s
mix sobelow --config	26s
mix spark.cheat_sheets --check	35s
mix spark.formatter --check	38s
mix test	3m 0s
mix deps.unlock --check-unused	28s
MIX_ENV=dev mix.compile	0s
mix docs	0s
Deploy docs to GitHub pages.	0s
	9m 18s

Provide feedback