Allow user to refresh page by using query parameter ?shareId={id}

[Luna-Klatzer]

Currently, when loading a file using a ShareURL, there is no way to reload the page without also pasting the URL in again. This is caused by the editor closing the file on a refresh (which is intended for the base route /editor as the file is not our own). Still, it would be good to allow the user to refresh the page using a query parameter, which defines the ShareURL id which can be used to fetch the required data from the server again.