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/ui/specs/components/DataTableSelectHeader/DataTableSelectHeader.json

@@ -0,0 +1,23 @@
+{
+  "description": "",
+  "methods": [],
+  "displayName": "DataTableSelectHeader",
+  "props": {
+    "ctx": {
+      "required": true,
+      "tsType": {
+        "name": "DataTableHeaderContext",
+        "elements": [
+          {
+            "name": "TData"
+          },
+          {
+            "name": "unknown"
+          }
+        ],
+        "raw": "DataTableHeaderContext<TData, unknown>"
+      },
+      "description": ""
+    }
+  }
+}