chore: reorganize docs apps (#7228)

* reorganize docs apps

* add README

* fix directory

* add condition for old docs

www/packages/remark-rehype-plugins/.eslintrc.cjs

@@ -0,0 +1,9 @@
+const path = require("path")
+
+module.exports = {
+  extends: ["docs"],
+  parserOptions: {
+    project: true,
+    tsconfigRootDir: path.join(__dirname, "..", ".."),
+  },
+}