Add links to blog series and starter kits

[one-aalam]

What kind of change does this PR introduce?

Docs update

What is the current behavior?

N/A

What is the new behavior?

N/A

Additional context

• Adds links to a 6-part blog series that walks the users through building an authentication system using Supabase and Next.js
• Adds links to two starter kits showing Supabase integration with Next.js and Svelte

[vercel]

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docs – ./web

🔍 Inspect: https://vercel.com/supabase/docs/AiFaFMGy1JuJTVdF1T7HjBLPo5Gv
✅ Preview: Failed

main – ./

🔍 Inspect: https://vercel.com/supabase/main/WYVrY2kE7kdxZZUiX4PH2aMx31G9
✅ Preview: https://main-git-fork-one-aalam-patch-2-supabase.vercel.app

www – ./www

🔍 Inspect: https://vercel.com/supabase/www/Gn166rywSdx4acaiiScgXDQYnjYh
✅ Preview: Canceled

nextjs-todo-list – ./examples/nextjs-todo-list

🔍 Inspect: https://vercel.com/supabase/nextjs-todo-list/A6LdCPn1KBXXb3AW7mzqYRWj8jQo
✅ Preview: Canceled