Formal way to take in token for slideUtil

In secure deployments, we need a token to upload slides. Thus, slideutil needs a better way to take in token. This is likely a good opportunity to make it take in arguments for filepath too.

Start by locating slideUtil and its current upload entry point, then inspect how it receives the slide filepath and handles deployment credentials. Define a command-line interface that accepts the token and filepath, and verify that secure deployments can upload slides without exposing the token.

Written by the indexing model from the issue text.