Restore missing CSS into less sources

[smashwilson]

This restores CSS rules that are present in the bundled main.min.css, but missing from the *.less sources. It also fixes the icomoon glyphs for GitHub, Twitter and so on. It's a bit hacky, but this is a stopgap for #1 so I can start use the theme (which I ❤️) but customize some of the colors.

Note that this doesn't get you quite to the point where a grunt execution causes no changes to the git status. imagemin still optimizes some of the images and there are a few minor CSS and JS differences remaining, mostly trivial ordering differences. Here's the full list:

smash@winter ~/code/Jekyll-HMFAYSAL-V2-Theme (restore-missing-styles=) $ git status
# On branch restore-missing-styles
# Changes not staged for commit:
#   (use "git add <file>..." to update what will be committed)
#   (use "git checkout -- <file>..." to discard changes in working directory)
#
#   modified:   assets/css/main.min.css
#   modified:   assets/js/scripts.min.js
#   modified:   images/Jekyll-HMFAYSAL-Theme.jpg
#   modified:   images/KY-Nailing-Machine.jpg
#   modified:   images/apple-touch-icon-114x114-precomposed.png
#   modified:   images/apple-touch-icon-144x144-precomposed.png
#   modified:   images/apple-touch-icon-72x72-precomposed.png
#   modified:   images/apple-touch-icon-precomposed.png
#   modified:   images/bio-photo.jpg
#   modified:   images/default-thumb.png
#   modified:   images/texture-feature-01.jpg
#   modified:   images/texture-feature-02.jpg
#   modified:   images/texture-feature-03.jpg
#   modified:   images/texture-feature-04.jpg
#   modified:   images/texture-feature-05.jpg