Adding new doc file may break existing URLs

[XiangRongLin]

With #31 I added a new doc file in between and incremented the number in the file names of the other files.

This means that any existing link out there to a specific file will break because the URL contains that number.
For example https://teamnewpipe.github.io/documentation/05_releasing/ will result in a 404 when that PR goes live.

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One solution would be to remove the enumeration. This will break all URLs once, but then it can't occur anymore.

[TheAssassin]

Why are they enumerated at all? To ensure their order in the sidebar?

... I really don't like this mkdocs stuff...

We might be able to preserve the old URLs by adding redirections. As the docs are located on GitHub (which we don't control), we'd have to use tags.

Edit: in case stripping the numbers is possible without having mkdocs reorder them in the table of contents, I'd go that route.