Supabase account creation email should have more details

[nitinthewiz]

Is your feature request related to a problem? Please describe.
Right now, when a user signs up, they get an email from Supabase that only says "Confirm your signup \n Follow this link to confirm your user:" and gives a link to verify account. This should have more details. Specifically, it should mention Chat Journal.

Describe the solution you'd like
A longer email that says something like "Welcome to Chat Journal! This begins your journey into self-discovery using ChatGPT as a journal help [...]. Please click the following link to confirm your account before logging in the first time:"

Describe alternatives you've considered
A full-blown marketing style email with responsive design.

Additional context
This is not necessarily a very high priority for now, because Chat Journal seems to be in soft-launch. Once you're ready to hard-launch, this should become important, because people like seeing a nice, clean, professional looking email.