Improve typography

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/assets/stylesheets/gitlab_bootstrap/mixins.scss

@@ -136,7 +136,7 @@
 }
 
 @mixin page-title {
-  color: $style_color;
+  color: #333;
   font-size: 20px;
   line-height: 1.5;
   margin-top: 0px;

app/assets/stylesheets/sections/projects.scss

@@ -27,7 +27,7 @@
 
   .project-home-title {
     font-size: 18px;
-    color: #777;
+    color: #444;
     margin: 0;
     line-height: 32px;
   }
@@ -40,7 +40,7 @@
 
     .project-home-desc {
       float: left;
-      color: #999;
+      color: #777;
     }
 
     .project-home-links {