docs: Update the tutorial to use Igniter (#271) #1060

Job	Run time
ash-ci / mix deps.get	14s
ash-ci / mix igniter.upgrade	3s
ash-ci / audit	33s
ash-ci / MIX_ENV=test mix.compile	26s
ash-ci / mix docs	36s
ash-ci / mix sobelow	21s
ash-ci / mix format --check-formatted	23s
ash-ci / Deploy docs to GitHub pages.	1s
ash-ci / mix spark.cheat_sheets --check	20s
ash-ci / mix spark.formatter --check	4s
ash-ci / MIX_ENV=dev mix.compile	20s
ash-ci / mix ash.codegen --check	0s
ash-ci / mix credo --strict	6s
ash-ci / mix dialyzer	3m 55s
ash-ci / mix test	1m 0s
ash-ci / mix deps.unlock --check-unused	30s
ash-ci / Release	0s
	8m 52s

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