Replace the broken links with a link to the front page of the Archive docs.

replace the broken links with a link to the front page of the Archive docs.

Look at the Slack conversation: https://couchbase.slack.com/archives/GCE1E2CFJ/p1689601934340849

and https://couchbase.slack.com/archives/CRWMUL4H5/p1690284392063559 for page https://docs.couchbase.com/sync-gateway/current/release-notes.html

link needed https://docs-archive.couchbase.com/home/index.html

CC Hakim Cassimally