Add donate link

Author: antonym

docusaurus.config.js

@@ -73,6 +73,11 @@ module.exports = {
           label: "Store",
           position: "left",
         },
+        {
+          href: "https://github.com/sponsors/netbootxyz",
+          label: "Donate",
+          position: "left",
+        },       
         {
           href: "https://github.com/netbootxyz/netboot.xyz",
           position: "right",