AC
* Templates, CSS, and javascript from 10h16 skin are moved from `app/` and `web/` to `skins/10h16`, the build script is changed accordingly.
** all assets (CSS, JS, img) from the web folder must be moved into the 10h16 skin folder and copied on build to `web/skins/10h16/` (to make for a single source of truth in `skins/`)
** careful, fundraising-frontent-content references some 10h16 resources (resolve!)
* CSS, Javascript, and assets are web accessible in the web folder while the `skins/` folder acts as the single source of truth (use build system)
* Which skins are used and which skin is the default skin can be specified in the configuration. (consider validating the config on deploy)
* `app/ab_test/` is deleted
** `no_phone` variant is made the default membership application page ([[ https://phabricator.wikimedia.org/T172886#3540572 | as per ]] @Tobias_Schumann_WMDE)
Background Info:
The contents of `web/skins/` folders should be put into `.gitignore`, but the folder itself should be checked it, best with a README file that explains how contents get there.