Add markdown support for rendering app, group, and tag descriptions

[barborico]

Overview

Supports rendering markdown descriptions in the detail pages for apps, tags, and groups. The description rendering won't change for other views. This rendering is pretty basic; e.g. no support for tables or HTML.

What this Looks Like

Samples of Rendered Markdown

The Original Unchanged List View

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[barborico]

I did have a thought that some descriptions might look better with a border, but didn't feel strongly. Trivial to add.

[somethingnew2-0]

Looks like a good addition, the react-markdown library looks safe to use (it uses the Shadow DOM) although we could start by allowlisting which HTML elements we want to support with the allowedElements=[] option.

Also, I think this centering of the markdown box and left justification of the text content works, although we may want to consider a simple heuristic of centering the text content if we detect that no Markdown is included (check for lines beginning with #, - or other common Markdown symbols).