Refactor collection creation UI (#6485)

* Iteration, before functional component

* Use react-hook-form, shared form for new and edit

* Avoid negative margin on input prefix

* Centered now default for modals

app/components/Sidebar/components/TrashLink.tsx

@@ -50,7 +50,6 @@ function TrashLink() {
           })}
           onRequestClose={() => setDocument(undefined)}
           isOpen
-          isCentered
         >
           <DocumentDelete
             document={document}