Merge branch 'project-desc-width' into 'master'

Changed project description width

## What does this MR do?

Changes the width of the project description to a max of `700px`

## What are the relevant issue numbers?

Closes #20020 

## Screenshots (if relevant)

![Screen_Shot_2016-07-21_at_12.51.59](/uploads/567f5b11553b45baa7fb07156e46b727/Screen_Shot_2016-07-21_at_12.51.59.png)

See merge request !5397

app/assets/stylesheets/pages/projects.scss

@@ -99,7 +99,7 @@
     margin-left: auto;
     margin-right: auto;
     margin-bottom: 15px;
-    max-width: 480px;
+    max-width: 700px;
 
     > p {
       margin-bottom: 0;