Add subcommands for help

[SGA-A]

Is your feature request related to a problem? Please describe. You are able to see a list of all the commands within the bot and sort them by their category. The problem lies in the fact that the description for these help commands are identical to the user-interface description of these commands. It does not go into further detail into the commands mechanism and how it works. This issue addresses this, by suggesting the build to look up detailed help for a specific command on the help subcommand, making the help command a group in the process.

Describe the solution you'd like

• Make the help command a group command.
• Rename the current command by changing its subcommand to 'category' leaving its qualified name to become 'help category'.
• Create a new help command to lookup help for a specific command. This will need to be implemented to be highly efficient as possible. It's not ideal to iterate through each command and find its matching name so instead we'll need to work out what else could be used.

Describe alternatives you've considered None at this time.

[SGA-A]

This is not needed. This is based on the assumption that everyone understands how each command works from the descriptions provided in the command.

For text commands, this is already resolved through the help command that sorts each command by their category. And at this scale, it is very unlikely any one will ever use nor notice this command.