docs(ui,docs): added upgrade guides link to UI docs (#5240)

* added medusa ui index page

* remove console

www/packages/docs-ui/src/components/Sidebar/Item/index.tsx

@@ -94,6 +94,7 @@ export const SidebarItem = ({
           }}
           replace
           shallow
+          {...item.linkProps}
         >
           <span>{item.title}</span>
           {item.additionalElms}

www/packages/docs-ui/src/providers/Sidebar/index.tsx

@@ -24,6 +24,7 @@ export type SidebarItemType = {
   children?: SidebarItemType[]
   loaded?: boolean
   isPathHref?: boolean
+  linkProps?: React.AllHTMLAttributes<HTMLAnchorElement>
 }
 
 export type SidebarSectionItemsType = {