SVGO v2.x changed configuration to JS, amending configuration. Adding new 'minify-svg' npm script. Also re-optimize SVGs. Bug: T278656 Change-Id: I88ebed650be0d20b71bca6f15f3aa70b6b5eb42a
Also amending `color` & `padding` to be closer to button standard appearance and increase `margin-bottom` to make “Edit links” link not stick to button. Bug: T170137 Change-Id: Iabb6abfdb8fa69c9f2634b190cb5fa6c005eb17c