docs: updates to admin customization docs (#7493)

* updated admin docs

* re-add navigation and parameters sections

* update injection zones

* update cli scripts docs

* added list of injection zones

* add details about widget props

* restructure admin injection zones

www/apps/resources/app/medusa-cli/page.mdx

@@ -588,7 +588,7 @@ npx medusa exec [file] [args...]
       </Table.Cell>
       <Table.Cell>
 
-      The path to a JavaScript file holding the function to execute.
+      The path to the TypeScript or JavaScript file holding the function to execute.
       
       </Table.Cell>
       <Table.Cell>