Alias for the `run`, `build` commands.

[Jerrody]

Cargo aliases:

• build -> b
• run -> r

Everybody uses these aliases. Would be great if to add them.

[VarunPotti]

Maybe we can have a custom alias handler (wherein you can create/delete aliases), as fleet has multiple other features (see todo.md).

[VarunPotti]

On a side note @dimensionhq we have also created shortkut