fix: change nginx root to standard /usr/share/nginx/html to resolve 404

nginx.conf

@@ -1,7 +1,7 @@
 server {
     listen 80;
     server_name _;
-    root /app;
+    root /usr/share/nginx/html;
     index index.html;
 
     # GZIP Compression

nginx.template.conf

@@ -1,7 +1,7 @@
 server {
     listen 80;
     server_name _;
-    root /app;
+    root /usr/share/nginx/html;
     index index.html index.php;
 
     # GZIP Compression

nixpacks.toml

@@ -1,3 +1,2 @@
-[variables]
-    NIXPACKS_PHP_ROOT_DIR = "/app"
-    NIXPACKS_PHP_FALLBACK_PATH = "/index.html"
+# Nixpacks configuration
+# Letting Nixpacks decide the best way to build, but keeping it as a reference.