This commit adds a badge to the navbar
that indicates if Canary is being used
When canary is not being used, it renders a link
to next.gitlab.com

Added stylelint to static-analysis
Updated yarn dependencies
CSS Fixes and rule adoptions of stylelint
Added stylelint-scss
Deduplicated yarn.lock to clear dependencies

First round of advanced stylelint rules

Mainly Vendor prefix updates related to flex

Updates to more webkit specific vendor prefixes

Finished all vendor specific fixes

Moved now 4 rules to warning

Fixed the new scss lint problems

More stylelint adaptions after rebase

Notable changes proposed by @pslaughter

Signed-off-by: Takuya Noguchi <takninnovationresearch@gmail.com>

Makes the following changes in order to have all the
items of the top nav fit within all of the new Bootstrap 4 breakpoints:

- Change GitLab logo to show only on desktop breakpoint (lg and up)
  - Move margin from logo to logo text, saving 8px
- Move the following icon links to the "More" nav dropdown
  - Instance Statistics (ConDev Index)
  - Admin area (if Admin)
  - Sherlock Transactions (if enabled)
- Removed separator between Admin icons
- Change search input width from 240px to 200px
- Move "Activity", "Milestone", and "Snippets" into "More" menu on lg breakpoints
- Show "More" menu of lg breakpoints