[IMPROVEMENT] Switch descriptions to markdown

[patrickmccallum]

Currently using dangerouslySetInnerHTML for mime descriptions on their pages. Was a non issue when repo was private, poses a risk now. Needs to be changed to use markdown or other format.

[luckv]

I don't know exactly how to render markdown in react, I'm not a web developer. But if you want I can make a pull request were I convert all descriptions in mimeData.json in markdown.
I found these js libraries to do this:

• https://github.com/mixmark-io/turndown
• https://www.npmjs.com/package/node-html-markdown