David Mehren 1f4388802b
Docs: Improve manual installation guide
- Move the requirements into an info block
- Make clear that we use Yarn Classic
- Link to our downloads page instead of GitHub
- Simplify paragraph about configuring HedgeDoc
- Move additional information into `<small>` tags
- Match upgrade documentation to installation steps.

Signed-off-by: David Mehren <git@herrmehren.de>
2021-04-15 21:52:58 +02:00
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