Part 3 of the migration.

Part 2 here: https://github.com/actualbudget/actual/pull/1419

Seems to build fine, will test later.

*  (prettier) adding trailing commas

* More commas

* Make ButtonSetting more generic

* Add an “Experimental Features” section in the settings

* Fix text color

* Put experimental features behind another link

* Update Encryption.js

* Update FixSplits.js

* Remove unused variable

* That’s what I get for coding on my phone

Co-authored-by: Matiss Janis Aboltins <matiss@mja.lv>

* Split the Settings component into multiple files (#434)
* Remove need for isMobile in CSS: lean on media queries in styles.js and glamor

Co-authored-by: Matiss Janis Aboltins <matiss@mja.lv>
Co-authored-by: Jed Fox <git@jedfox.com>