[ci skip]

It didn't make sense to merge CE master into EE master, and *then* do
the RC1 tasks (e.g., install/update docs) because then the RC1 won't
have the updated docs.

[ci skip]

[ci skip]

I think this helps the release manager because it means they don't
have to worry about others pushing commits at the last minute.

The relative link that was there before breaks when you copy-paste the
issue template into an actual issue.

Remove CI sections related to release tool, update steps in monthly and patch release documentation.

product names, plus a couple of instances of bad Markdown markup.

Added DISCLAIMER to CHANGELOG