* remove placeholder image
* add videos for setup extension
* add support for mobile viewports
* add mobile/responsiveness for setup extension page
* add videos from `assets.bitwarden.com`
* align with figma for borders and shadow
* make text responsive for setup headings
* remove period
* add tests
* add tests for video sequence
* force font weight on `h2`
* add 8px to bottom margin of video container
