* nginx: optimize locations

* nginx: don't use regex in locations

* nginx: optimize Cache-Control headaers

* nginx: use 404 error_page for missing static files

* nginx: sort locations

* nginx: add missing HSTS header

* Update nginx.conf

* Update nginx.conf

* Update nginx.conf

* Update mastodon-web.service

* Update mastodon-streaming.service

* Update mastodon-sidekiq.service

* templates/systemd/mastodon: add new sandboxing options

* templates/systemd/mastodon: add '@privileged' and remove duplicates SystemCallFilters

* templates/systemd/mastodon: add '@ipc' SystemCallFilter

* templates/systemd/mastodon: add '@memlock' SystemCallFilter

* templates/systemd/mastodon: allow '@resources' filter to mastodon-web service

By default, it'll only send those headers when the response code is one of the following:
- 200, 201, 204, 206, 301, 302, 303, 304, 307 & 308

As all the traffics should be https, the http protocol only exists to do 301 redirect,
and always send the HSTS header is almost one of the best practices, we should set
nginx to do so.

Reference:
- https://nginx.org/en/docs/http/ngx_http_headers_module.html#add_header
- https://ssl-config.mozilla.org/

It's default turned on, but it's better to turn it off for security reason.

Reference:
- https://nginx.org/en/docs/http/ngx_http_ssl_module.html#ssl_session_tickets
- https://github.com/mozilla/server-side-tls/issues/135

Always mark jemalloc needed if jemalloc is enabled by akihikodaki · Pull Request #4627 · ruby/ruby
https://github.com/ruby/ruby/pull/4627
> Symbols exported by jemalloc is referred by the shared library but not
> by the executables when building Ruby as a shared library with
> jemalloc. It causes shared libraries such as the GNU C++ library
> occasionally rely on the memory allocator provided by the standard C
> library. Worse, the resolved symbols can later be replaced with
> jemalloc, and jemalloc may see pointers from the standard C library,
> which results in various failures.
> e.g. https://github.com/tootsuite/mastodon/issues/15751

As a workaround, do not rely on jemalloc enablement of Ruby, and
preload libjemalloc.so instead.

This fixes a bug that prevents logins to mastodon onion services. The
nginx directive assumed all requests were made over https, causing a
domain mismatch for onion services that have https redirects disabled.
The fix more correctly sets X-Forwarded-Proto to the actual scheme used
in the request.

Maintain TLS v1.2 compatibility (might want to drop this later) and add support for TLS v1.3

So they can be copied during installation instead of looking
them up in the documentation

Make default sidekiq configuration use weighted queues

Remove deprecated docs directory