refactor: rename pop up contract to pop deploy contract

[AlexD10S]

Running a network is not equivalent to deploying a contract, therefore the commands should be different.

Use pop deploy contract instead of pop up contract as the command for deploying a contract to a running network.

Once this is implemented, allow pop up to run the parachain without requiring the keyword parachain.

Suggested by Bruno here #129 (comment) to improve the UX.