Add Customizations.

- Add PrismJS dependencies (baked-in)
- Add Ko-fi button (in-line)
- Bump dependencies to fix inability to build.
- Concatenate *.css into single source.css.

partials/components/footer.hbs

@@ -1,6 +1,5 @@
 <footer class="gh-footer{{#match @custom.header_and_footer_color "Accent color"}} has-accent-color{{/match}} gh-outer">
     <div class="gh-footer-inner gh-inner">
-
         <div class="gh-footer-bar">
             <span class="gh-footer-logo is-title">
                 {{#if @site.logo}}