chore: migrate sign in to domain relative path with clerk, add .env.example as well

web/.env.example

@@ -20,3 +20,14 @@ PLAUSIBLE_DOMAIN=
 
 NEXT_PUBLIC_POSTHOG_KEY="your-api-key"
 NEXT_PUBLIC_POSTHOG_HOST="your-ph-address"
+
+NEXT_PUBLIC_CLERK_SIGN_IN_URL=/auth/sign-in
+NEXT_PUBLIC_CLERK_SIGN_UP_URL=/auth/sign-up
+NEXT_PUBLIC_CLERK_AFTER_SIGN_IN_URL=/
+NEXT_PUBLIC_CLERK_AFTER_SIGN_UP_URL=/
+
+STRIPE_API_KEY="sk_test_"
+STRIPE_PR_PRO="price_"
+STRIPE_PR_ENTERPRISE="price_"
+STRIPE_PR_API="price_"
+STRIPE_WEBHOOK_SECRET="whsec_"