docs: update to next 15 + eslint 9 (#9839)

* update next

* updated react

* update eslint

* finish updating eslint

* fix content lint errors

* fix docs test

* fix vale action

* fix installation errors

www/packages/tailwind/eslint.config.mjs

@@ -0,0 +1,13 @@
+import eslintConfig from "eslint-config-docs"
+
+export default [...eslintConfig.base, {
+    languageOptions: {
+        ecmaVersion: 5,
+        sourceType: "script",
+
+        parserOptions: {
+            project: true,
+            tsconfigRootDir: __dirname,
+        },
+    },
+}];