Add documentation

docs/example-nginx.conf

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+server {
+  listen 443 ssl http2;
+  listen [::]:443 ssl http2;
+
+  server_name status.example.com;
+
+  access_log /var/log/nginx/access.log;
+  error_log /var/log/nginx/error.log warn;
+
+  ssl_certificate /path/to/cert.pem;
+  ssl_certificate_key /path/to/cert.key;
+
+  # Make Gatus API available relative to the frontend
+  location /api/v1/endpoints/statuses {
+    proxy_pass http://gatus:8080/api/v1/endpoints/statuses;
+    proxy_set_header Host $host;
+    proxy_redirect http:// https://;
+    proxy_http_version 1.1;
+    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+  }
+
+  # Frontend
+  root /var/www/html;
+  index index.html index.htm;
+  location / {
+    try_files $uri $uri/ =404;
+  }
+}