docs(ui,docs): Add documentation for Medusa UI 2.0.0 (#5227)

* add docs for medusa ui 2.0.0

* fix: copy as child example

* fix: dropdown menu example

* add accordion examples

* fix lint issues

* fix apos in progress tabs demo

* resolve comments

* add icon

* bump z-index on modals to prevent clashing with navbar

* add sidebar item and card

* undo modal z index changes

* add links to updated and new components

* update version

* rm inline code formatting on links

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Co-authored-by: Shahed Nasser <shahednasser@gmail.com>

www/apps/ui/src/examples/code-block-demo.tsx

@@ -5,6 +5,7 @@ const snippets = [
     label: "cURL",
     language: "markdown",
     code: `curl -H 'x-publishable-key: YOUR_API_KEY' 'http://localhost:9000/store/products/PRODUCT_ID'`,
+    hideLineNumbers: true,
   },
   {
     label: "Medusa JS Client",