docs: add `slidev-addon-rabbit` to addon gallery #1158

Job	Run time
pack	1m 14s
test (ubuntu-latest, npm, true)	2m 58s
test (ubuntu-latest, npm, false)	2m 48s
test (ubuntu-latest, pnpm, true)	2m 3s
test (ubuntu-latest, pnpm, false)	2m 11s
test (windows-latest, npm, true)	6m 1s
test (windows-latest, npm, false)	6m 8s
test (windows-latest, pnpm, true)	6m 1s
test (windows-latest, pnpm, false)	4m 7s
	33m 31s

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