Implement Downloading Data

[jjstnlee]

first sprint woo!!
For this sprint, we want to allow the user to download the current filtered/searched projects by pressing a button. Don't worry abt the styling rn, but for now just implement a button that when clicked, downloads the project data from supabase as a csv file onto the user's local computer.

1. Create a new component under the components folder called DownloadData or something like that
2. To test your new component, add a new folder like /app/testing/page.tsx, and add the button here and go to http://localhost:3000/testing

This is a challenging first sprint, so no worries if you need additional time just let me know!