Add AndyZe, mikeferguson, JafarAbdi, felixvd as maintainers

[davetcoleman]

• Add as maintainers @AndyZe, @mikeferguson, @JafarAbdi, @felixvd
• Move to inactive bmagyar, IanTheEngineer, 130s
• Alphabatize maintainers
• Update Core Contributors

As discussed in offline maintainer emails and during last public working group

[felixvd]

LGTM, although you could have "alphabatized" the Core Contributors while you were at it :)

[rhaschke]

If you sort maintainers, you should sort core contributors and alumni as well.

[davetcoleman]

It was late at night and I was lazy, but fixed:

[rhaschke]

Thanks.

[v4hn]

We discussed this somewhere else before with @tylerjw :
Sorting by first name strikes me as really awkward and last time we ended up sorting by last name.

A "leaderboard" would be a nice addition, sorting by contributions in the last year, but that idea clearly does not belong in this PR. :-)

[davetcoleman]

I really like the leaderboard idea! I actually already have one in GSheets that scrapes the Github API, but would be awesome to expose that to the webpage.

Regarding sorting by first or last, I don't care if you want to open a new PR to re-order them by last but for now I'd like to merge the maintainer additions. Instead of manual sorting, I also think we could setup some Jekyll magic

[v4hn]

I really like the leaderboard idea! I actually already have one in GSheets that scrapes the Github API

Would be great to see this on the website! :-)