add calcurse config, radicale config, nginx config

nginx-conf/README.md

@@ -0,0 +1,19 @@
+# nginx-config
+
+In `/etc/nginx/sites-enabled`
+
+- file: `sub.domain.com`:
+```
+server {
+        server_name sub.domain.com;
+
+        location / {
+                proxy_pass http://localhost:PORT;
+                proxy_http_version 1.1;
+                proxy_set_header Upgrade $http_upgrade;
+                proxy_set_header Connection "upgrade";
+                proxy_read_timeout 86400;
+        }
+}
+```
+Then generate certificate with `certbot`