Lots of changes

- add tags.hbs
- add home.hbs, copy of index.hbs
- change <h1> global font size
 make some animations faster
- make post title & footer background black instead of animated gradient
- make "services" link in navbar white instead of animated gradient
- move some css classes to screen.css to allow tags.hbs accessing them
- fix policy popup being covered (issue #001)
- fix policy popup style
- fig kg-bookmark thumbnail image
- add PT Serif font
- add category and posted date under post title
- move big post cards to post-card-big.hbs, so both index, home and tags can access it
- mode post post cards style to new post-card-style.css file
- update page.hbs, now rendering correctly and including content
- add "l" size to package.json, to allow more high-res images

post.hbs

@@ -1,9 +1,13 @@
 {{!< default}}
 <div class="mind-page-title unselectable">
   {{#post}}
+
+<div>
     <h1>{{title}}</h1>
+    <p><a href="{{primary_tag.url}}">{{primary_tag.name}}</a> • <time class="post-date" datetime="{{date format='YYYY-MM-DD'}}">{{date format="DD MMMM YYYY"}}</time></p>
+</div>
   {{/post}}
-  <i class="arrow-down"></i>
+  <i class="mind-all-title_arrow-down mind-all-title_arrow-down-mid"></i>
 </div>
 
 <main>
@@ -14,7 +18,7 @@
       {{#post}}
       <div class="mind-post_content">
         <div class="mind-post_content-header">
-          <img class="mind-post_feature-image" src="{{img_url feature_image}}"/>
+          <img class="mind-post_feature-image" src="{{img_url feature_image size="l"}}"/>
         </div>
         {{content}}
         <hr>