Display avatar left of comments by default

Previously avatars would be displayed on top of comments. Most comment
and forum systems will display avatars to the left of comments/posts.
The https://github.com/snorremd/talk-plugin-gravatar plugin currently
renders avatars in the avatar slot which will render the avatar on top
of the comments. This change modified the comment container to be
displayed as a flex container with row direction. It also adds 10px top
margin to the avatar slot which corresponds with the comment header.

Signed-off-by: Snorre Magnus Davøen <snorremd@gmail.com>

client/coral-embed-stream/src/tabs/stream/components/Comment.css

@@ -138,6 +138,7 @@
 }
 
 .commentAvatar {
+  margin-top: 10px;
   max-width: 60px;
 }
 

client/coral-embed-stream/style/default.css

@@ -112,6 +112,11 @@ body {
   position: relative;
 }
 
+.talk-stream-comment {
+  display: flex;
+  flex-direction: row;
+}
+
 /* Comment styles */
 .comment {
   margin-bottom: 10px;