User Story - Edit-Form for Collections/Decks

Value proposition

As a user I want to edit my collections and change the title.

[x] every collection has an edit-menu
[x] the edit-form shows the inital value, a save- and an cancel-button
[x] after clicking the cancel-button I'll get back to the Collection overview
[x] the modified values are also saved in the db
Tasks
[x] create a branch named feat/collectionform
[x] create a CollectionForm-component with function handleSubmit() and handleCancel(), return form with an input-field and 2 buttons
[x] add async function updateCollection with prop collection, fetch API, use method PUT, mutate()
[x] add function editCollection with prop collection to _app.js, add a toast-message, add it as prop to the Component
[x] create folder [id] in folder pages/collections and a file named edit.js
- [x] add the function EditCollectionPage, useRouter
[x] add function onEdit to component CollectionMenu, use useState for the menu and router.push