Started styling the new about screen.
Moved .visually-hidden into general for DRY.
Small spacing fixes.
Finished styling the about screen and implemented it in the app.
Added dynamic abilities to the about screen: height resizing, version loading, license loading.
Changed links to open in the default browser.
Removed the source code link from help because it is now in about.
Made the license link in the help menu open the about screen to the right tab.
Fixed a bug in the about screen when building the application.
Removed the credits file now that there's a fancy about screen.
Merge pull request #11 from thomasjbradley/fancy-about-screen

Fancy about screen