fix: init don't make the dependencies target specific and don't install

[ruben-arts]

This avoids pixi from adding the deps to the target tables. E.g.:

#before:
[target.linux-64.dependencies]
x = "*"
# after
[dependencies]
x = "*"

And this disables the install on import. No idea why we did that but 99% of the time it annoyed me.

[Hofer-Julian]

Both, that pixi init doesn't make dependencies target specific and that it doesn't install makes sense to me and works as expected