Make sure certain args in entrypoint.py work with the new UI

[dan-niles]

With the introduction of the new UI, we need to support the arguments in the entrypoint.py file that alter the look of a channel.

• [x] --profile (Sets the profile image for the channel)
• [x] --banner (Sets the banner image for the channel)
• [ ] --main-color (Sets the main color for the channel)
• [ ] --secondary-color (Sets the secondary color for the channel)