Document the file structure of the project (#232) #393

Job	Run time
collect-release-info	6s
analyze	36s
collect-docsite-release-info	5s
unpublish_docsite	0s
test (3.0, rails_6_1, rspec_lt_3_10)	2m 0s
build-docsite	0s
test (3.0, rails_6_1, rspec_gte_3_10)	2m 5s
test (3.0, rails_7_0, rspec_lt_3_10)	2m 2s
test (3.0, rails_7_0, rspec_gte_3_10)	1m 59s
test (3.0, no_rails, rspec_lt_3_10)	1m 37s
test (3.0, no_rails, rspec_gte_3_10)	1m 41s
test (3.1, rails_6_1, rspec_lt_3_10)	2m 8s
test (3.1, rails_6_1, rspec_gte_3_10)	2m 6s
test (3.1, rails_7_0, rspec_lt_3_10)	2m 8s
test (3.1, rails_7_0, rspec_gte_3_10)	2m 11s
test (3.1, no_rails, rspec_lt_3_10)	1m 44s
test (3.1, no_rails, rspec_gte_3_10)	1m 34s
test (3.2, rails_6_1, rspec_lt_3_10)	2m 5s
test (3.2, rails_6_1, rspec_gte_3_10)	2m 3s
publish-docsite	0s
test (3.2, rails_7_0, rspec_lt_3_10)	2m 7s
test (3.2, rails_7_0, rspec_gte_3_10)	2m 2s
test (3.2, no_rails, rspec_lt_3_10)	1m 33s
test (3.2, no_rails, rspec_gte_3_10)	1m 32s
test (3.3, rails_6_1, rspec_lt_3_10)	2m 18s
test (3.3, rails_6_1, rspec_gte_3_10)	2m 18s
test (3.3, rails_7_0, rspec_lt_3_10)	2m 12s
test (3.3, rails_7_0, rspec_gte_3_10)	2m 9s
test (3.3, no_rails, rspec_lt_3_10)	1m 49s
test (3.3, no_rails, rspec_gte_3_10)	1m 40s
ready-to-merge	1s
	47m 51s

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