add comments to nginx file

docker/nginx.conf

@@ -3,35 +3,34 @@ events {
 }
 
 http {
-  access_log /dev/stdout;
-  error_log /dev/stdout;
+  access_log /dev/stdout; # Log access to stdout
+  error_log /dev/stdout; # Log errors to stdout
 
+  # Log format
   log_format main '[$time_local] "$request" '
                   '$status $body_bytes_sent "$http_referer" '
                   '"$http_user_agent" "$http_x_forwarded_for"'; 
 
-  include       mime.types;
-  default_type  application/octet-stream;
+  include       mime.types; # Include the mime types file
+  default_type  application/octet-stream; # Default type
+
+  sendfile            on; # Send files directly from disk
+  keepalive_timeout   15; # Keep connections alive for 15 seconds
+  types_hash_max_size 4096; # Max number of mime types
+
+  # TCP optimizations
+  tcp_nopush          on; # Send headers in one packet
+  tcp_nodelay         on; # Don't wait for packets to be full
   
-  sendfile            on;
-  tcp_nopush          on;
-  tcp_nodelay         on;
-  keepalive_timeout   15;
-  types_hash_max_size 4096;
 
   server {
-    server_name _;
-    listen 80;
+    server_name _; # Listen on all hostnames
+    listen 80; # Listen on port 80
 
-    root /var/www/html;
-    index index.html index.htm;
-
-    # TCP optimizations
-    tcp_nopush on;
-    tcp_nodelay on;
+    root /var/www/html; # Serve files from /var/www/html
+    index index.html index.htm; # Serve index.html and index.htm by default
 
     # Gzip
-    sendfile on;
     gzip on;
     gzip_disable "msie6";
     gzip_vary on;
@@ -42,6 +41,7 @@ http {
 
     client_max_body_size 500M; # Will get replaced by the environment variable MAX_UPLOAD_SIZE
 
+    # Upload endpoint
     location /upload.php {
       try_files $uri =404;
 
@@ -53,6 +53,7 @@ http {
       include fastcgi_params;
     }
 
+    # Serve your files
     location / { 
       expires 7d;