build: remove postinstall script

[cf-remylenoir]

Purpose of PR

Removes the postinstall script, one can use the generic build command when needed.

This unblocks Netlify's dry-run build which tries to access turbo when it isn't installed yet.

Alternative: move Storybook's production build & deployment to Vercel.

[vercel]

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Name	Status	Preview	Updated (UTC)
forma-36	✅ Ready (Inspect)	Visit Preview	Jul 15, 2024 1:44pm

[changeset-bot]

⚠️ No Changeset found

Latest commit: 0c04fb2

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[github-actions]

size-limit report 📦

Path	Size	Loading time (3g)	Running time (snapdragon)	Total time
CommonJS	138.29 KB (0%)	2.8 s (0%)	143 ms (+69.9% 🔺)	3 s
Module	134.6 KB (0%)	2.7 s (0%)	143 ms (+56.95% 🔺)	2.9 s