[ruby/rdoc] Display class ancestors in the sidebar #1183 #777

Job	Run time
make (check, cppflags=-DVM_CHECK_MODE)	8m 1s
make (check, i686)	10m 27s
make (check, --disable-yjit)	6m 57s
make (check, --enable-shared --enable-load-relative)	7m 18s
make (check, true, --with-shared-gc=/home/runner/ruby_gc)	7m 12s
make (test-bundler-parallel, 50)	27m 32s
make (test-bundled-gems)	16m 41s
make (check, ubuntu-20.04)	10m 10s
make (check, ubuntu-24.04)	9m 8s
Ubuntu result	1s
	1h 43m 27s

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