Document the file structure of the project #391

Job	Run time
collect-release-info	14s
analyze	36s
collect-docsite-release-info	4s
unpublish_docsite	0s
test (3.0, rails_6_1, rspec_lt_3_10)	2m 4s
build-docsite	28s
test (3.0, rails_6_1, rspec_gte_3_10)	2m 1s
test (3.0, rails_7_0, rspec_lt_3_10)	2m 0s
test (3.0, rails_7_0, rspec_gte_3_10)	2m 4s
test (3.0, no_rails, rspec_lt_3_10)	1m 32s
test (3.0, no_rails, rspec_gte_3_10)	1m 37s
test (3.1, rails_6_1, rspec_lt_3_10)	2m 11s
test (3.1, rails_6_1, rspec_gte_3_10)	2m 7s
test (3.1, rails_7_0, rspec_lt_3_10)	2m 5s
test (3.1, rails_7_0, rspec_gte_3_10)	2m 6s
test (3.1, no_rails, rspec_lt_3_10)	1m 38s
test (3.1, no_rails, rspec_gte_3_10)	1m 41s
test (3.2, rails_6_1, rspec_lt_3_10)	2m 7s
test (3.2, rails_6_1, rspec_gte_3_10)	2m 3s
test (3.2, rails_7_0, rspec_lt_3_10)	2m 4s
test (3.2, rails_7_0, rspec_gte_3_10)	2m 1s
test (3.2, no_rails, rspec_lt_3_10)	1m 33s
test (3.2, no_rails, rspec_gte_3_10)	1m 38s
test (3.3, rails_6_1, rspec_lt_3_10)	2m 18s
test (3.3, rails_6_1, rspec_gte_3_10)	2m 13s
test (3.3, rails_7_0, rspec_lt_3_10)	2m 10s
test (3.3, rails_7_0, rspec_gte_3_10)	2m 14s
test (3.3, no_rails, rspec_lt_3_10)	1m 42s
test (3.3, no_rails, rspec_gte_3_10)	1m 44s
publish-docsite	8s
ready-to-merge	1s
	48m 24s

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