Move the bot off-NBDb

[NeoMahler]

In preparation for server migration, all commands that depend on the NBDb should be moved to a self-sufficient method.

Steps:

• [x] Migrate data from NBDb to new simplified JSON structure.
• [x] Migrate /identity
• [x] Migrate /pronoun
• [x] Migrate /pronountest
• [x] Migrate /flag
• [x] Clean up Utilities Cog