Update and create new issue templates for better ctageorisation
[128 of 600 issues are just questions and support and this is getting out of hand IMHO](https://github.com/PrivateBin/PrivateBin/issues?q=is%3Aissue+is%3Aopen+label%3Aquestion%2Fsupport), so I thought we need to do something while of course IMHO keeping support in some sense that is vital to an open-source project.
Anyway, this here now:
* Converts the "one and only issue template" to multiple ones with the new GitHub way, see https://docs.github.com/en/communities/using-templates-to-encourage-useful-issues-and-pull-requests/
Note this uses mostly the templates they have, modifies them to use proper headers (sorry but I don't get why they always want to use **bold text** as headers, when you have real markdown headings) and adjusts/ports the
* We could use even more elaborate issue forms, but that was too much for me to do now and is also beta, so maybe when they have a visual editor for that or so 😉 https://docs.github.com/en/communities/using-templates-to-encourage-useful-issues-and-pull-requests/configuring-issue-templates-for-your-repository#creating-issue-forms
The aim:
* is to get support requests and stuff directly sorted and tagged, so they are out the way
* is to nudge people to improve the quality of issues/reports by providing a more useful template or their use case
* is to redirect people to the appropriate resource (give me a moment)
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