Align SVG markup across Foundation products by
- unifying XML declaration,
- removing `enable-background` as it's deprecated and
- unifying whitespace.
Bug: T178867
Change-Id: I32972de815484fa89bd7cdacbbcd65f4663a4161
Aligning 'noimage' to overhauled color palette, background-color
equaling footer color and icon color going to closest,
minimally higher contrast color `#72777d`.
Bug: T172850
Change-Id: I949db4983910ef6609124adbfcd3c0d31a7f7eb4
* Move across all files
* Rename ext-card- prefix to ext-related-articles- prefix
** Since all code using these prefixes is JS
we do not have to worry about cached HTML
Bug: T137021
Change-Id: I784fd132c36329fa0dcc49fe2804460061940347
