Optimized UX and fixed bugs

- Added temp logo
    - Added favicon
    - Enabled Disqus (jekyll.env)
    - Changed Home layout

_includes/comments-providers/disqus.html

@@ -1,4 +1,4 @@
-{%- if page.key and
+{%- if page.url and
   site.comments.disqus.shortname -%}
 
   <div id="disqus_thread"></div>
@@ -8,7 +8,7 @@
   *  LEARN WHY DEFINING THESE VARIABLES IS IMPORTANT: https://disqus.com/admin/universalcode/#configuration-variables*/
   var disqus_config = function () {
     this.page.url = '{%- include snippets/page-url.html -%}';
-    this.page.identifier = '{{ page.key }}';
+    this.page.identifier = '{{ page.url }}';
   };
   (function() { // DON'T EDIT BELOW THIS LINE
     var d = document, s = d.createElement('script');