Make `wasmer publish` and `wasmer deploy` more similar

[zebreus]

In my mental model, wasmer publish and wasmer deploy do two very similar things. Both process a wasmer.toml, publish pushes that to the registry as a reusable package, and deploy pushes that to wasmer edge, where the application actually runs. However, for wasmer publish I can specify a path as a positional argument, while I need to cd into the directory with the wasmer.toml for wasmer deploy.

It would be nice if I could use wasmer deploy path/to/wasmer/toml instead of cd path/to/wasmer/toml ; wasmer deploy