Style links in blob viewer

Keep styling from when they weren't clickable
But add an underline on hover to denote that they're links
Remove specific link styling from each theme

app/assets/stylesheets/highlight/common.scss

@@ -29,3 +29,12 @@
     color: $link;
   }
 }
+
+// Links to URLs, emails, or dependencies
+.code .line a {
+  color: inherit;
+
+  &:hover {
+    text-decoration: underline;
+  }
+}

app/assets/stylesheets/highlight/themes/dark.scss

@@ -193,11 +193,6 @@ $dark-il: #de935f;
     color: $dark-highlight-color !important;
   }
 
-  // Links to URLs, emails, or dependencies
-  .line a {
-    color: $dark-na;
-  }
-
   .hll { background-color: $dark-hll-bg; }
   .c { color: $dark-c; } /* Comment */
   .err { color: $dark-err; } /* Error */

app/assets/stylesheets/highlight/themes/monokai.scss

@@ -193,11 +193,6 @@ $monokai-gi: #a6e22e;
     color: $black !important;
   }
 
-  // Links to URLs, emails, or dependencies
-  .line a {
-    color: $monokai-k;
-  }
-
   .hll { background-color: $monokai-hll; }
   .c { color: $monokai-c; } /* Comment */
   .err { color: $monokai-err-color; background-color: $monokai-err-bg; } /* Error */

app/assets/stylesheets/highlight/themes/none.scss

@@ -143,12 +143,6 @@
     background-color: $white-normal;
   }
 
-    // Links to URLs, emails, or dependencies
-  .line a {
-    color: $gl-text-color;
-    text-decoration: underline;
-  }
-
   .hll { background-color: $white-light; }
 
   .gd {

app/assets/stylesheets/highlight/themes/solarized-dark.scss

@@ -196,11 +196,6 @@ $solarized-dark-il: #2aa198;
     background-color: $solarized-dark-highlight !important;
   }
 
-  // Links to URLs, emails, or dependencies
-  .line a {
-    color: $solarized-dark-kd;
-  }
-
   /* Solarized Dark
 
   For use with Jekyll and Pygments

app/assets/stylesheets/highlight/themes/solarized-light.scss

@@ -204,11 +204,6 @@ $solarized-light-il: #2aa198;
     background-color: $solarized-light-highlight !important;
   }
 
-  // Links to URLs, emails, or dependencies
-  .line a {
-    color: $solarized-light-kd;
-  }
-
   /* Solarized Light
 
   For use with Jekyll and Pygments

app/assets/stylesheets/highlight/white_base.scss

@@ -209,11 +209,6 @@ span.highlight_word {
   background-color: $white-highlight !important;
 }
 
-// Links to URLs, emails, or dependencies
-.line a {
-  color: $white-nb;
-}
-
 .hll { background-color: $white-hll-bg; }
 
 .c { color: $white-c;