As a FAC grad, I can delete my stored data

[helenzhou6]

• Inform the user on sign up that their details will be saved to a database - issue Inform the user on sign up that their details will be saved to a database #119
• Change "account settings" link on my profile page to "delete account" - with a pop up 'are you sure' before proceeding - issue Change "account settings" link on my profile page to "delete account" #120
• Have a protected route for /deleteaccount - issue Have a protected route for /deleteaccount #121
• SQL query to delete details based on github_id - issue SQL query to delete details based on github_id #122
• Another unprotected endpoint to inform the member their data has been deleted, and deletes their cookies - issue Inform the user account deleted and delete their cookies #123