fix: social media icons were giant by default

[wesleyboar]

Overview

Social media icons need not be giant by default.

^{I had misconception any size meant a standard I commit to, but I found a simple solution.}

Related

• mimicked by fix: giant social media icons by default - off stable #1028

Changes

• added default size for icons (match font-size)
• fixed extra space within link around svg

Testing

0. Add snippet with "Template" of share_on_social.html.
1. Verify SVG size matches font-size by default.
2. Verify SVG size can be increased with CSS.
3. Verify link around SVG has no extra space.
   ^{Hover over icon, see no underlined space.}

UI

no.underlined.space.mov