Begin CSS refactoring for improved organization

CSS code was divided in multiple files, however this was not practical
for organization since different pages needed different CSS classes one
 another, that were in most of those CSS files.

This commit brings (mostly) everything in one file with a table of
contents on top.

An exception is made for fonts, that are now in a separate "fonts.css"
file, since they contain fundamentally different things.

Classes organization is not yet complete, however a great part was done.
Next commits will finalize this organization and finish moving classes.

Signed-off-by: Lorenzo Dellacà <lorenzo.dellaca@mind-overflow.net>

index.hbs

@@ -1,22 +1,21 @@
 {{!< default}}
 
-<div class="mind-site-title unselectable" id="vantajs">
+<div class="mind-index-title_main unselectable" id="vantajs">
   			<h1>{{@site.title}}</h1>
-        <i class="mind-all-title_arrow-down mind-all-title_arrow-down-big"></i>
+        <i class="mind-global-title_arrow-down mind-global-title_arrow-down-big"></i>
 </div>
 
 
 <main>
-  <nav class="navbar-secondary unselectable">
+  <nav class="mind-global-navbar_secondary unselectable">
     {{navigation type="secondary"}}
   </nav>
   <div class="mind-content_main">
-    <div class="mind-feed_main">
+    <div class="mind-feed-content_main">
 
       <!-- Looping through every post -->
       {{#foreach posts}}
       	{{> "post-card-big"}}
-        </article>
       {{/foreach}}
     </div>
   </div>