Adding RPM doc

[Sir-Thom]

Description

• Added to distribute directory rpm.mdx
• Added section about how to sign manually

TODO

• [x] add section for how to sign with tauri
• [x] make doc more "clean"
• [x] fixing grammar

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[FabianLars]

Thanks for applying my feedback. Another thing the changes made me notice is that as far as i know, our convention is to keep the tauri.conf.json minimal to only what's actual changed, for example like here https://v2.tauri.app/develop/resources/ (to keep pages a bit easier on the eyes)

[FabianLars]

don't mind the failing format check now. It can't handle mdx files very well. I'll fix it (not really) in another PR i'm already working on.