According to https://github.com/sponsors/Homebrew

Removed IRC mention (#machomebrew). This IRC channel is not being actively used by our community ( 0 active users ).

Let's try to nudge more people over and see how it goes.

Anywhere we can use `blob/master` we can use `blob/HEAD` instead. This
will make life easier if we ever rename our default branch in future
(once/if Git and GitHub provides the necessary tooling to do so).

Who Are You? -> Who We Are

- remove Jenkins Testing support from `brew pull`
- update reference to MacStadium Orka
- remove reference to DigitalOcean

Welcome to the team!

I have stepped down and Sean has replaced me.

- We don't have a badge for other donation methods - this looked slightly out of place.

Move "Donations" below "Contributing" so people see it more and remove CommsWorld who we no longer use.

Let people know we support this now. Don't need a dedicated link because we have one at the top of the page.

Some arriving, some leaving.

We're using GitHub Actions now.

This allows maintaining more settings in one place.

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

Welcome to the team!

Today the Homebrew maintainers elected a new PLC, TSC and project lead.
Documentation is to follow detailing exactly the responsibilities for
each of these roles but adjust these to reflect the current state until
that point.

Coveralls works fine for PRs but is a bit too flaky for the master branch.

Welcome!

Mostly edits to formatting, grammar, wording for consistency & readability.

I resign from Homebrew with immediate effect.

Goodbye Homebrew.

Add Steven to maintainers and Dom to PLC.