docs: fix build errors + update medusa docs link (#8550)

* docs: update medusa docs link

* fix @medusajs/icon version

* fix user guide build

* fix build error

www/packages/docs-ui/package.json

@@ -60,7 +60,7 @@
     "react-dom": "^18.2.0"
   },
   "dependencies": {
-    "@medusajs/icons": "^1.2.0",
+    "@medusajs/icons": "preview",
     "@medusajs/ui": "^3.0.0",
     "@octokit/request": "^8.1.1",
     "@react-hook/resize-observer": "^1.2.6",