Implement database

[LouisCaerts]

• [ ] LouisCaerts/Procrastination-MP-final-web-app#2
• [ ] LouisCaerts/Procrastination-MP-final-web-app#1
• [ ] LouisCaerts/Procrastination-MP-final-web-app#14
• [ ] LouisCaerts/Procrastination-MP-final-web-app#13
• [ ] LouisCaerts/Procrastination-MP-final-web-app#12

[LouisCaerts]

Based on previous research we will most likely use Supabase's free tier for convenience reasons.