Totally remove mapbox-studio-classic

[typebrook]

@jirik @klokan @MartinMikita @lukasmartinelli
I want to totally remove mapbox-studio-classic from openmaptiles.
Please give me some feedback! Thanks!

Since travis build for mapbox/mapbox-studio-classic keeps failing from 9 months ago, I think there is no evidence that this project is alive/backed by Mapbox.

ref:
Travis build history: https://travis-ci.org/mapbox/mapbox-studio-classic/builds
related issue : mapbox/mapbox-studio-classic#1581

The latest PR about mapbox-studio-classic is #304 (tiny part of quickstart refactoring #261 )
But since the author stopped working on it for 9 month, and original intend is moving it to Makefile, I think it's OK to just make another tiny commit on master branch.

by the way, it is a little scary that master branch stopped at 👹 666 commits over 2 months. if experienced contributors think it is OK, I will quickly make a simple PR for this.

[MartinMikita]

Hi @typebrook,

You can prepare a PR with a removal of mapbox-studio-classic, or you can try to find a way to get it working.

Well, there were no required changes, and we are still looking for enthusiastic contributors ;)

[typebrook]

@MartinMikita Thanks for your reply, PR made #506
Removal is simple, but I think more important things is the necessity evaluation for this move.
I don't have any experience about this classic version, but it just annoyed me by failing on it's docker running.

Any Mapbox worker/experienced user here? Do we still need this thing?

[typebrook]

#506
Close