Add initial 11ty website structure

website/node_modules/please-upgrade-node/index.d.ts

@@ -0,0 +1,11 @@
+interface Options {
+  exitCode: number;
+  message: (version: string) => string;
+}
+
+declare function pleaseUpgradeNode(
+  pkg: Record<string, unknown>,
+  opts?: Partial<Options>
+): void;
+
+export = pleaseUpgradeNode;