Add command to update onboarding

[MattIPv4]

Once any new emoji and channels have been added, there should be a new command to update the server onboarding.

There are three questions in the server onboarding flow:

1. Which JetBrains products are you interested in? - This has an All option with the 💠 emoji which unlocks the products category, and then options for every JetBrains product using the respective product emoji and unlocking the respective product channel.
2. Which JetBrains educational tools are you interested in? - Again, with the All option and then options for each educational tool.
3. Which JetBrains open-source projects are you interested in? - Again, with the All option and then options for each open-source project.