Remove buffering from nginx config, make config secure by default

[SuperSandro2000]

Turning off proxy buffering is not recommend by upstream https://www.nginx.com/blog/avoiding-top-10-nginx-configuration-mistakes/#proxy_buffering-off by default. And making configuration more secure by removing TLSv1 TLSv1.1 and redirecting to https all the time to never leak credentials.

PS: https is not annoying and curl can follow redirects with -L.

[binwiederhier]

My apologies for not getting to this earlier, but I'm not sure I 100% agree with the PR.

• I do agree with the TLS cipher suite changes, those should be in the example
• As I said before, I do want people to be able to use curl without typing the https:// part, and I want the sample setup to reflect that. So maybe we can just have two examples like that? Let me try to see what I can whip up.

[binwiederhier]

Added two nginx configs: One called "convienient" and one called "more secure" (yours). https://github.com/binwiederhier/ntfy/blob/main/docs/config.md?plain=1#L437

Also added some explanations. I don't have the time to try the output buffering stuff, but I swear I had issues with that.