Replace link icons (PNGs) with Glyphicons.
Merge branch 'ahaerpfer-feature/link-icons-glyphicons' into font-icons
icon updates

* changed some icons
* adjusted icon size, positions and margins
* set line height of icons to 1
* colored icons in gray rather than the inherited blue-ish color
* a few typo fixes
removed link icons for thumbnails etc

Removed icons from links which have wiki transclusions as their titles.
Merge pull request #1 from dossist/font-icons

Link icons updated
Some more tuning of icons, color and scaling.
Merge pull request #30 from ahaerpfer/feature/link-icons-glyphicons

Thanks for the PR! Merged.
I will check if this works properly, and when everything is OK, I will merge `font-icons` branch into `main`.
minor code cleaning (no functional changes)
Merge pull request #31 from dossist/font-icons

Changed link icons from bitmap to Glyphicons (font)