theme: revert fontawsome to version 5 for IE11 compat

[McShelby]

[Nuc1eoN]

Ahhh dammit, I liked the new icons 😢

[McShelby]

Sorry for that, as IE11 is still a thing for my company :-(

The icons used in the theme are okay in either Fontawesome version.

But in my company we are also using a lot of icons inside our sites (usually for menu entries) and those are imho sub par in version 6. The sizing seems a bit off in direct comparison to the version 5 icons.

Anyways, this was not the reason to switch.

But..., you can overwrite the fontawesome.min.css and the files of webfonts in your project's static folder. Sadly there is one reference that also needs to be changed in the CSS.

[Nuc1eoN]

Yeah not sure if it is worth the effort though. Or rather the increased maintainance burden.

I am very happy with how my documentation code has turned out, especially with relearn v3. Very straight forward, easy to maintain, easy for others to get into.