* Add api methods for subscription
* Small changes
* little changes in remark.tsx
* disallow pass className to Button and Input
* Subscribe block
* add RSS and Email subscription drobdowns
* add hook useTheme
* unify dropdown import/export
* Change API
* rename subscribe methods
* add unsubscribe method
* Add email subscription to settings and user
* Refactor and add new steps
* render by single component
* add final step
* add unsubscribe step it user is subscribed
* Add tests
* Update subscription logic
* test without mocking redux methods but with mocking store
* update user in store after subscribe and unsubscribe
* little changes in subscription flow
* fix drobdown size
* Fix RSS subscription link for site
* fix link
* add test for RSS subscription
* Fix showing email subscription
* it don't show to unauth users
* it don't show to anonymous users
* it tested
* isUserAnonymous is a bit rewrited
* isUserAnonymous is tested
* Make Email button visible for anon users
* React X supporst Fragments thats why .babelrc changed
* disabled button is more visible
* fix hovering on disabled buttons
* create mocks for tests
* move email dropdown to __subscribe-by-email
Vyrtsev Mikhail