docs: add `slidev-addon-rabbit` to addon gallery (#1890) #1164

Job	Run time
pack	1m 16s
test (ubuntu-latest, npm, true)	3m 10s
test (ubuntu-latest, npm, false)	3m 13s
test (ubuntu-latest, pnpm, true)	2m 17s
test (ubuntu-latest, pnpm, false)	2m 17s
test (windows-latest, npm, true)	8m 4s
test (windows-latest, npm, false)	6m 26s
test (windows-latest, pnpm, true)	6m 8s
test (windows-latest, pnpm, false)	7m 45s
	40m 36s

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