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