add docs page to cancancan using vitepress (#841) #357

Job	Run time
Lint	21s
Test (2.6, gemfiles/activerecord_5.0.2.gemfile)	52s
Test (2.6, gemfiles/activerecord_5.1.0.gemfile)	47s
Test (2.6, gemfiles/activerecord_5.2.2.gemfile)	51s
Test (2.6, gemfiles/activerecord_6.0.0.gemfile)	46s
Test (2.6, gemfiles/activerecord_6.1.0.gemfile)	1m 4s
Test (2.7, gemfiles/activerecord_5.0.2.gemfile)	1m 21s
Test (2.7, gemfiles/activerecord_5.1.0.gemfile)	1m 19s
Test (2.7, gemfiles/activerecord_5.2.2.gemfile)	1m 20s
Test (2.7, gemfiles/activerecord_6.0.0.gemfile)	1m 22s
Test (2.7, gemfiles/activerecord_6.1.0.gemfile)	1m 20s
Test (2.7, gemfiles/activerecord_main.gemfile)	43s
Test (3.0, gemfiles/activerecord_6.0.0.gemfile)	1m 8s
Test (3.0, gemfiles/activerecord_6.1.0.gemfile)	1m 7s
Test (3.0, gemfiles/activerecord_main.gemfile)	45s
Test (jruby, gemfiles/activerecord_5.1.0.gemfile)	1m 11s
Test (jruby, gemfiles/activerecord_5.2.2.gemfile)	1m 12s
Test (jruby, gemfiles/activerecord_6.0.0.gemfile)	2m 21s
Test (truffleruby, gemfiles/activerecord_6.0.0.gemfile)	52s
Test (truffleruby, gemfiles/activerecord_6.1.0.gemfile)	50s
Test (truffleruby, gemfiles/activerecord_main.gemfile)	1m 12s
Test (gemfiles/activerecord_7.0.0.gemfile, 3.1)	1m 6s
Test (gemfiles/activerecord_7.0.0.gemfile, 3.0)	1m 8s
Test (gemfiles/activerecord_6.1.0.gemfile, 3.1)	1m 16s
	26m 14s

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