add caddy and nginx instructions

docs/setup_caddy.md

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+# Setting up Caddy for GotHub
+
+Setting up caddy is not hard at all, and certificate generation is handled by itself for you.
+
+After installing caddy, append the following to the `Caddyfile`:
+
+```caddyfile
+gothub.domain.tld {
+	reverse_proxy localhost:3000
+}
+```

docs/setup_nginx.md

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+# Setting up NginX for GotHub
+
+!!! note
+	
+	NginX does not support automatic certificate generation. You need to use `certbot` to create and maintain the certificates but that is out of scope of this tutorial.
+
+After installing NginX, create /etc/nginx/conf.d/gothub.conf with the following contents
+
+```nginx
+server {
+    listen 80;
+    listen [::]:80;
+    listen 443 ssl http2;
+    listen [::]:443 ssl http2;
+
+    server_name gothub.domain.tld;
+
+	# Recommended but not required
+    access_log off;
+    error_log /var/log/nginx/error.log crit;
+
+    location / {
+        proxy_pass http://127.0.0.1:3000;
+        proxy_set_header X-Forwarded-For $remote_addr;
+        proxy_set_header Host $host;    # so GotHub knows domain
+        proxy_http_version 1.1;     # to keep alive
+        proxy_set_header Connection ""; # to keep alive
+    }
+}
+```
+