Include a Mastodon link besides the user name below post titles

We show the Mastodon URL alongside the website URL and XMPP address.
This crowds the user box even more and I think LinuxFR should switch to
using a proper profile page instead.

This was requested by Adrien Dorsaz.

Author: nud

app/assets/stylesheets/parts/a_tag.scss

@@ -25,11 +25,12 @@ body {
   background: linear-gradient(
       90deg,
       $C_CLAIR,
-      $C_CLAIR $PX_BRANDING_LARG,
-      $C_CONTAINER $PX_BRANDING_LARG,
+      $C_CLAIR $PX_BRANDING_LARG + 1px,
+      $C_CONTAINER $PX_BRANDING_LARG + 1px,
       $C_CONTAINER
     )
     #fff;
+  background-repeat: no-repeat;
 }
 
 a {

app/assets/stylesheets/parts/big_footer.scss

@@ -6,6 +6,8 @@
   padding: 0 0 20px 0;
   background: $C_CLAIR;
   background: linear-gradient(to bottom, $C_FOOT 0%, white 100%);
+  background-repeat: no-repeat;
+  background-position: 0 0;
 
   a {
     font-size: 0.75em;
@@ -25,6 +27,8 @@
       $C_MIBLANC_MIFOOT 50%,
       $C_FOOT 100%
     );
+    background-repeat: no-repeat;
+    background-position: 0 0;
     min-height: 360px;
 
     border-bottom-right-radius: $RAY_FOOT;

app/assets/stylesheets/parts/tab.scss

@@ -3,7 +3,7 @@
   display: flex;
   -ms-flwx-wrap: wrap;
   flex-wrap: wrap;
-  background: linear-gradient(to top, $C_INACTIVE 2px, transparent 2px);
+  background: 0 0 no-repeat linear-gradient(to top, $C_INACTIVE 2px, transparent 2px);
   .tab {
     font-size: 1.5em;
     line-height: 1.3em;

app/assets/stylesheets/parts/top_menu.scss

@@ -10,9 +10,11 @@
   background: linear-gradient(
     to right,
     #fff,
-    #e7e3e0 $PX_BRANDING_LARG,
+    #e7e3e0 $PX_BRANDING_LARG + 1px,
     #bdb3aa 50%
   );
+  background-repeat: no-repeat;
+  background-position: 0 0;
 
   /* we recycle the nav bar to display the black line at the top */
   .go_to_content {

app/helpers/node_helper.rb

@@ -111,6 +111,7 @@ def posted_by(content, user_link='Anonyme')
       user_infos = []
       user_infos << homesite_link(user)
       user_infos << jabber_link(user)
+      user_infos << mastodon_link(user)
       user_infos.compact!
       user_link += (" (" + user_infos.join(', ') + ")").html_safe  if user_infos.any?
     end

app/helpers/users_helper.rb

@@ -40,4 +40,8 @@ def jabber_link(user)
     link_to("adresse XMPP", "xmpp:" + user.jabber_id)
   end
 
+  def mastodon_link(user)
+    return if user.mastodon_url.blank?
+    link_to("Mastodon", user.mastodon_url)
+  end
 end