This PR updates the conf.yaml to start building 8.16 Kibana Guide and Installation and Upgrade Guide from the 8.x branches.
It also:
Removes attributes that were added to work around broken links from other books, since the full set will now be live
Adds a conditional clause to the code that checks the Kibana UI links, since otherwise it was seeking an 8.16 branch
Cleans up a "main" branch from one of the conf.yaml lines related to the v6.2 shared attributes, since that branch doesn't care about those attributes.
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This PR updates the conf.yaml to start building 8.16 Kibana Guide and Installation and Upgrade Guide from the 8.x branches.
It also: