Increase md typography font size

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

app/assets/stylesheets/generic/files.scss

@@ -42,7 +42,6 @@
   }
   .file-content {
     background: #fff;
-    font-size: 11px;
 
     &.image_file {
       background: #eee;
@@ -54,8 +53,6 @@
     }
 
     &.wiki {
-      font-size: 14px;
-      line-height: 1.6;
       padding: 25px;
 
       .highlight {

app/assets/stylesheets/main/mixins.scss

@@ -58,8 +58,8 @@
 }
 
 @mixin md-typography {
-  font-size: 14px;
-  line-height: 1.6;
+  font-size: 15px;
+  line-height: 1.5;
 
   img {
     max-width: 100%;
@@ -93,7 +93,7 @@
 
   blockquote p {
     color: #888;
-    font-size: 14px;
+    font-size: 15px;
     line-height: 1.5;
   }