Wrong notation for SvelteKit for `.env` variables

[iarata]

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Use Supabase with SvelteKit

Describe the problem

The docs for setting up Supabase for SvelteKit mentions to define the .env variables as VITE_PUBLIC_SUPABASE_URL and VITE_PUBLIC_SUPABASE_PUBLISHABLE_KEY but then accessing them from $env/static/public results in an issue due to the requirement of PUBLIC_ prefix

Describe the improvement

The .env variables, if they're safe to be exposed publicly should be renamed to:

• PUBLIC_VITE_SUPABASE_URL
• PUBLIC_VITE_SUPABASE_PUBLISHABLE_KEY

[Harshthakur24]

I have fixed it in the documentation. If any admin is reading this, please pull my request.

[iarata]

@Harshthakur24 There's already a PR for this issue #39457 - see the previous PRs before making a new one