install: clarify distro required dependencies

From Fedora 40?, `libsodium-devel` is required for `_get_nacl()`

remove extra Debian pkg installation dependencies

`python3-wheel` shouldn’t be necessary with `pipx` installation
The two others are development dependencies are probably here
in case wheels have to be built because there are missing

Not sure if this is still needed with more recent distros
Distros such as Mint and Raspbian might have wrong dependency tree