Description

Updates the Discord slash command for /link <net id> to trigger email sending logic impl'd in #84, allowing users to begin the registration flow when no user exists for that net id.

Closes #82

Pre-Merge Checklist

• I've tested my code and solemnly swear that it works flawlessly
• For features, new functionality, or major refactors: My changes are gated behind feature flag(s).
  • Why? Feature flags allow us to continuously deploy new changes, but control if/when those changes actually go live in a Club Manager instance, and soft-revert changes if things don't work as expected. This means we don't need to keep a separate develop vs main branch.
  • Bug fixes should merge straight into main with no flags.
  • Flags should default off. When your feature flag is disabled, Club Manager should behave as it did before your changes - as if your code does not exist. Database migrations should be fine to hang around.

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