added migrations and seed script

[Devank-Sachdeva]

Related Issue

closes #79

Description

added Supabase Migrations to create database structure according to the table_setup.md file

2 new environment variables added
SUPABASE_ACCESS_TOKEN
this can be obtained from https://supabase.com/dashboard/account/tokens
and
SUPABASE_DB_PASSWORD
this can be obtained when first created the account or resetting the db password from
SupaBase Dashboard -> Project Settings -> Database

To run Migrations run the commands
npx supabase link --project-ref <your project reference ID>
project reference ID can be found in the project settings (SupaBase Dashboard -> Project Settings)
and running
npx supabase db push
this creates the database structure

To Seed the database
npm run db:seed
this script seed your database with sample data

Type of PR

• Bug fix
• Feature enhancement
• Documentation update
• Other (specify): _______________

Screenshots / videos (if applicable)

Checklist:

• I have performed a self-review of my code
• I have read and followed the Contribution Guidelines.
• I have tested the changes thoroughly before submitting this pull request.
• I have provided relevant issue numbers, screenshots, and videos after making the changes.
• I have commented my code, particularly in hard-to-understand areas.