Add links and fix nits for extensions #94

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Run time

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Job	Run time
Smoke test: stock R	5m 49s
windows-latest (release)	18m 3s
pkgdown	7m 50s
macos-latest (release)	6m 12s
ubuntu-20.04 (release)	5m 36s
ubuntu-22.04 (devel)	5m 14s
ubuntu-22.04 (release) with covr	6m 30s
ubuntu-22.04 (oldrel-1)	5m 53s
ubuntu-22.04 (oldrel-2)	6m 18s
ubuntu-22.04 (oldrel-3)	4m 38s
	1h 12m 3s