Feature Request: Add option to edit app's .desktop file

[WebShapedBiz]

• My proposal does not exist in the PLANNED & NOT PLANNED.md document
• I have not found any other opened issues on the same feature request
• I believe this fits within Warehouse's scope of Flatpak management

It's not easy to find a .desktop file for Flatpak apps, and I think the option to edit and save .desktop files could help many users. Similar to the AppEditor app for deb installs.

Cheers.