[FEATURE] Add or improve `/help` command.

[hitblast]

Description

Previously, our /help commands had no better use other than providing not-so-useful information about the bot. The task here is to re-add the command with the following things:

• A short description of what the bot does.
• A button to view and scroll through the existing commands.
• Every detail other commands have in common.

Help from the documentation might be helpful since it contains the necessary guidelines on how to contribute with code to our project.

Screenshots

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Additional information

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