chore: move docs-util to www (#7232)

* reorganize docs apps

* add README

* fix directory

* add condition for old docs

* move docs-util to www

* remove remaining docs-util

* fixes of paths

* fix scripts

* path fixes

* fix github actions

* add build packages script

www/utils/.gitignore

@@ -0,0 +1,2 @@
+dist
+.yarn