Commands revamp

[mrphlip]

• Move static commands and responses from data.json into the database
• Don't show all the commands and responses on a single page, there's too much
• Edit commands one at a time, instead of posting the entire response list at once - closes #773

[mrphlip]

Realising as I try to fall asleep that I forgot to make the webserver notify the bot when the commands have changed, to make it reload. Dropping to draft.