chore: add new examples for supabase.io and also vercel subscription payment starter

Author: MildTomato

src/site/_data/examples/nextjs-and-supabase-subscription-payments.yaml

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+title: Next.js and Supabase Subscription Payments
+description: The all-in-one starter kit for high-performance SaaS applications. With a few clicks, Next.js developers can clone, deploy and fully customize their own SaaS subscription application.
+link: https://subscription-payments.vercel.app/
+thumbnailurl: /img/examples/nextjs-and-supabase-subscription-payments.png
+tools:
+  - Vercel
+  - TailwindCSS
+  - Supabase
+  - Supabase Auth

src/site/_data/examples/supabase.yaml

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+title: Supabase
+description: The Open Source Firebase Alternative
+link: https://supabase.io
+thumbnailurl: /img/examples/supabase.png
+tools:
+  - Netlify
+  - TailwindCSS
+  - Styled Components
+  - Supabase
+  - Supabase Auth