Click New Project, name it anything (e.g. shoot-locations), choose US East as your region, set a database password, and wait for it to provision (~2 min).
In the left sidebar, click SQL Editor. Open the file supabase_setup.sql (provided alongside this file), paste the entire contents, and click Run.
Go to Settings → API. Copy your Project URL and anon/public key.
Open this HTML file in any text editor. At the very top of the <script> section, replace the two placeholder values: