Make config file a config file

[Ten0]

Currently the configuration appears to be stored in an esoteric format in .local/share/Emote.
This makes it hard to configure in any other way than using the CLI, and consequently hard to understand and/or reuse the configuration file as appropriate across different installations.

That would be easier if the configuration part (especially the bindings) was stored as a regular text file.
(Ideally that would be stored in .config/Emote, as most other software does)

(For context, I'm using Nix to declare all my configurations synchronized across all my machines.)
Also I wouldn't like to get the popup the first time I launch the software on a given machine.

Thanks,