Add Short Description.

Currently the home page of the app restricts the existing description to 140 character limit.

Instead, we should provide a short description and long description.

- The Long Description should be long enough to add a paragraph or two.
- The Short Description should be capped at 140 to 150 characters.

This will ensure that all dapps on the home page can have a complete but shorter version of the description that is not cut off at a random place in the longer description text.

We will need to update the storage and Submit new application form to have inputs for a new short description.
We will need to use short description on home page and normal description on detail page.

No files or tests are named. Trace the existing description through storage, the Submit new application form, the home page, and the detail page. Done means storing separate short and long descriptions, enforcing a 140–150 character short description, and showing the short text on the home page and the normal description on the detail page.

Written by the indexing model from the issue text.