This will improve the output and ease of parsing while allowing code to
be removed from brew-test-bot which relates only to a single repo (this
one).

- Make all `odeprecated` from 2.1.0 `odisabled` instead
- Remove dead code that won't be run now
- Remove (unused) `or_later` handling for bottles

Some arriving, some leaving.

This variable allows a user to configure how often `brew update` runs.
With the previous implementation, however, it was still pretty slow as
it would run some of `brew update` even within the timeout. This feels
related to complaints about Homebrew "feeling slow" since we enabled
this. Address this by:

- making `HOMEBREW_AUTO_UPDATE_SECS` behave more like
  `HOMEBREW_NO_AUTO_UPDATE` and entirely skip the invocation of
  `brew update` if the relevant tap (homebrew-core or homebrew-cask
  depending on command invoked) has been checked in the last
  `HOMEBREW_AUTO_UPDATE_SECS`
- Only require/check the update of a single tap rather than every tap
- Increase the default value of `HOMEBREW_AUTO_UPDATE_SECS` from 1m
  to 5m to cut people a bit more slack. We're not updating things
  often enough for 1m not to feel a bit overkill and 5m feels
  appropriate for a Homebrew "session" to only require a single update.

Fixes #6300

bump-revision will increase by one the revision or add "revision 1" if
it doesn't exist.

People are using this instead of adjusting their PATH.

Tap pinning is not used by Homebrew or the Homebrew maintainers so issues relating to pinned taps (#5418, #5796) don’t get fixed. Tap pinning does not work consistently or reliably and is conceptually confusing to encourage users to use fully-scoped user/tap/formula naming or avoid shadowing core tap formulae' names instead.

When reading the comment header of a shell command, omit options that
are in Homebrew::CLI::Parser.global_options, since they are documented
separately for all commands.

And update docs.

This is a clearer branding for us to use.

Also, as part of testing this, make some fixes to Jekyll in the docs folder.

Fixes #5835

Accounts for paragraph breaks and option descriptions. Also fixes some help text nits.