docs: add initial Mediary user guide

nginx.conf

@@ -0,0 +1,16 @@
+server {
+    listen 80;
+    server_name _;
+    root /usr/share/nginx/html;
+    index index.html;
+
+    location / {
+        try_files $uri $uri/ $uri.html =404;
+    }
+
+    location ~* \.(?:css|js|svg|png|jpg|jpeg|webp|ico|woff2?)$ {
+        expires 7d;
+        add_header Cache-Control "public, immutable";
+        try_files $uri =404;
+    }
+}