* Improve onboarding UI and UX (P1)
- Introduce Crayons variables
- Remove unnecessary CSS files to have just one CSS file
* Add new onboarding tests
* Update onboarding yarn test to reflect updated class names
* set up refactored onboarding
* create onboarding page
* add in first slide and change slide functionality
* fix test suite
* profile refactor
* profile refactor
* refactor to api
* add checkbox fields
* add checkbox fields
* remove puts
* add basic css
* add styling
* add redirect
* hide back and next at first and last slides
* test refactored onboarding
* test refactored onboarding
* remove article edits
* Fix schema
* Add deleted file back in
* Add default value for checked_t&c column
* Adjust HTML structure to keep nav buttons in place
* Fix ESLint issues on Onboarding.jsx file
* Handling for undefined or empty followedTags on getUserTags
* Fix codeclimate issues
* Fix codeclimate issues
* Fix more codeclimate issues
* Fix more codeclimate issues
* Update Onboarding snapshots
* Uncheck the CoC and T&C checkboxes on render
* Update snapshots
* Return false instead of raising error
* Update spec to use new onboarding
* Redirect to onboarding if haven't seen it yet
* Prevent redirect to onboarding from /signout_confirm
* Use assign_attributes instead of saving twice
* Move COC and T&C checkbox page to second slide
* Add 'go back to original page' functionality
* Reuse ready prototype logic
* Keep track of the last visited onboarding page
* Fix email subscription bug
* Fix overflow issue for tags page
* Remove height to prevent page container scrolling
* Check for CoC and T&C for displaying onboarding
* Add InstantClick redirect and preserve referrer in client
* Fix async update + check by using localStorage
* Turn off onboarding for tests
* Finalize design for onboarding
* Finalize design for onboarding
* Make bulk follows during onboarding
* Fix bulk follow test
