Add ability to have content that purely redirects to another url

[chipsenkbeil]

Currently, the list shows content including the title of the article, a summary of the article, any associated tags, and optionally a header image representing the article.

A nice feature that I would need for my own website's sections would be image only options in the same vein as the cells on the main page, where hovering over the cell highlights it and displays text. Clicking the cell redirects you to a new url. This would be useful for projects that might just point Github repositories.

[chipsenkbeil]

Implemented using the redirect = "example.com' front matter. List page now displays the article button in red with REDIRECT as the text instead of READ MORE.