docs: migrate UI docs (#13245)

* docs: create a new UI docs project (#13233)

* docs: create a new UI docs project

* fix installation errors

* docs: migrate UI docs content to new project (#13241)

* Fix content

* added examples for some components

* finish adding examples

* lint fix

* fix build errors

* delete empty files

* path fixes + refactor

* fix build error

www/apps/api-reference/next.config.mjs

@@ -50,7 +50,6 @@ const withMDX = createMDX({
             },
             ui: {
               projectPath: path.resolve("..", "ui"),
-              contentPath: "src/content/docs",
             },
             "user-guide": {
               projectPath: path.resolve("..", "user-guide"),