This is the Flutter source code for this project.
To install clone this repo and execute:
$ flutter build --release
The binary is builded and can be found in ./build/linux/release/bundle/shortcuts.
In the end add it to the path (in my case /opt is in the PATH):
ln -s /opt/shortcuts $(pwd)/build/linux/release/bundle/shortcuts
As it is flutter, one should be able to build it also on "all" other architectures, but this is untested and no installation guide is given.