Fixes#30265
1. Read second type of dependencies
2. Render `Description` and `ReleaseNotes`
old:

new:

The NuGet spec does not specify what kind of text can be stored in the
description but we can best guess markdown. The official NuGet registry
just [converts the newlines to html
lines](https://www.nuget.org/packages/rb.Firefox#readme-body-tab).
3. Extract and render the readme. This is the new and better place to
store larger text than in the description. The content is markdown.

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Co-authored-by: Benjamin Heemann <benjamin.heemann@raith.de>