Add "open in reddit" button to all pages (#304)

* Pass the url parameter to all templates. Add a reddit_link to the navbar, which opens the current url on reddit.

* Add icon for reddit link

Co-authored-by: spikecodes <19519553+spikecodes@users.noreply.github.com>

templates/post.html

@@ -55,6 +55,7 @@
 			</p>
 
 			<!-- POST MEDIA -->
+			<!-- post_type: {{ post.post_type }} -->
 			{% if post.post_type == "image" %}
 			<a href="{{ post.media.url }}" class="post_media_image" >
 				<svg