[FEATURE] Swag catalog command

[mcpenguin]

With the Discord server supposed to function as an extension of the CSC office, and with the office now fully operational, we should implement some Codey commands that are office-related. One such command is a command that displays a swag catalogue.

The command should have

• a catalogue of CSC swag
• a subcommand for each swag item that brings up a more detailed description of it, price, whether it is in stock etc

We should coordinate with the Community Coordinators (ie Reps) to achieve this.

[mcpenguin]

Currently, the swag stock is stored in a Google Sheet. I'm thinking of having some admin commands to manually update the stock of individual swag, and like a .swag command to see the stock of swag currently in the office.

[mcpenguin]

Actually, maybe we can use the sheets API: https://developers.google.com/sheets/api/samples/reading