Render markdown in project descriptions

[rhdunn]

Feature Description

Currently, project descriptions do not support markdown.

This can be useful for formatting the text, adding several paragraphs to the description, adding links, etc..

Screenshots

No response

[JakobDev]

Markdown is already supported, but not mentioned. The Field also don't use the markdown editor. I will create a PR for this.

[Jaffex]

It currently seems that the project description in the repository scope does render markdown while the project description in the organisation scope does not.

[wxiaoguang]

The project description is rendered as markdown now: