Add initial setup for Central DNS and PXE services using dnsmasq

- Created README.md for Central setup documentation.
- Added dnsmasq configuration files and scripts for setting up DNS and PXE booting.
- Implemented nginx configuration to serve PXE boot assets.
- Developed setup.sh script to automate installation and configuration of dnsmasq and nginx.
- Removed outdated dnsmasq setup guide from documentation.

central-setup/dnsmasq/nginx.conf

@@ -0,0 +1,9 @@
+server {
+    listen 80;
+    server_name _;
+
+    location / {
+        autoindex on;
+        root /var/www/html/talos;
+    }
+}