[Suggestion] Generate build in a dedicated 'bin' folder

[erciccione]

When building, firo-cli and 'firod' will be created in /src, mixed with many other files and folders. firo-qt will be generated in the qt folder, along with several other files.

This is not convenient and forces the user to look through multiple files when looking for the binaries, probably ending up using a search tool to find what they are looking for.

I suggest to have a dedicated bin folder where built binaries are stored.

[levoncrypto]

@erciccione Have you tried build with guix?

[erciccione]

@levoncrypto i did not, i'm referring to building normally as instructed in the docs.