Updated all the places in the SCSS where we use Darken and Lighten properties.
These properties have been problematic in the past and caused some state issues, e.g. New message(s) hightlight (which was fixed seperately from this issue)
* start building ev3 landing page structure
* Inject translations, add more content and structure to ev3 landing page
* Add ev3 route
* add active styles for os chooser buttons
* Add ev3 assets
* Add content and intial styles for everything down to "Sample Projects"
* Add correct padding to all sections on ev3 page
* Add more margins to match the mockup
* Create os chooser component for reuse on other landing pages
* Make EV3 page stateful, add OS logic, change step styles, fix images on Chrome
* Add sample project cards and styles
* Add fixed ev3 icon svg
* Add app store badges (no href on links yet)
* Add section separator, fix sample project card margins
* Add border to project cards, make project cards clickable links
* Add FAQ boilerplate and styling from InformationPage component
* Add indented ol style, example
* Add link style with underline
* Add EV3 retail link
* Content updates
* Fix some z-index issues with os chooser
* micro:bit page mega-commit
* os chooser should not have a higher z-index than nav
* Update starter projects
* Localize OS chooser
* Add localization configuration for EV3 page
* Localize section titles on ev3 page
* Add starter project images and descriptions
* Add link to microbit.org
* Fix tip box width on microbit and ev3 pages
* add l10n strings up to things to try on ev3 page
* Fix lint error in ev3.scss
* Add download link style to ev3
* microbit getting started text and images
* Remove tip about microbit name
* Hex file and starter project download links
* microbit wording updates
* update images
* Fix issues with download link style
* text fix
* Add ev3 starter project downloads
* Add microbit l10n file and config
* Add l10n strings for microbit header and scratch link sections
* Add l10n strings for microbit page up to faq
* content updates
* Fix some page overflow issues
* microbit faq content and style
* Use zipped version of microbit hex file
* Add platform name to scratch link download button
* Add EV3 faq to l10n.json
* Add final strings from micro:bit and EV3 pages to l10n.json files
* Add white download asset
* Tweak styles for ev3 and microbit
* Add some final tweaks to the EV3 page styles
* Add TODO comments about refactoring duplicate code
