“Components”: Add modifier colors, visited link and fix minor inconsistencies (#378)
Updating WikimediaUI Components overview with modifier colors, that
are not part of the official color palette choices, but modfifications
of those for a number of widget states. Also
- adding visited link treatment as proposed in T213778
- unfiying dropdown symbols, resolving a width inconsistency issue there
- fixing vertical alignment in buttons (the hundreds time, Sketch is not on my side here)
- removing specifications structure part, it's only noise at this point
- unifying min-width button descriptions
- updating RSS file to auto-push to all Sketch file library users