TLS support (#11678)

* implement self signed cert and monitor/reload

* move go2rtc upstream to separate file

* add directory for ACME challenges

* make certsync more resilient

* add TLS docs

* add jwt secret info to docs

docker/main/rootfs/usr/local/nginx/conf/go2rtc_upstream.conf

@@ -0,0 +1,4 @@
+upstream go2rtc {
+    server 127.0.0.1:1984;
+    keepalive 1024;
+}