Remove the last few “regular” commands that are still in the bot

[odrling]

Currently we still have the following bot commands that have not been made into slash commands:

• 7import
• 7link (still arguably useful for guild and emote links)
• 7move
• 7prune
• 7histoire
• 7collect (seems easy to convert)
• 7pot (seems easy to convert)
• 7presence (seems easy to convert)
• 7kininarimasu (can probably just be an easter egg at this point)