Optimize SVGs and align colors to WikimediaUI palette

Aligning SVGs to WikimediaUI color palette.
Additionally optimizing by help of SVGO and aligning them to each other,
among changes:
- removing `standalone="no"` attribute as its default
- removing invisible, application specific metadata
- reduction or removal of `id`s where applicable
- unifying identation
- sorting attributes in similar order

Bug: T152025
Bug: T178867
Change-Id: Ia693b2092bbb730ccaabe75bec563bc3a64cc108