[icons] Remove icons from build

[Jordan-Mysten]

This changes icons to use generate instead of build so that it's no longer included in turbo builds. The build artifact is the source, and is checked-in, so this should not be needed.

[vercel[bot]]

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Name	Status	Preview	Comments	Updated
explorer	✅ Ready (Inspect)	Visit Preview	💬 Add your feedback	Feb 2, 2023 at 5:36PM (UTC)
frenemies	✅ Ready (Inspect)	Visit Preview	💬 Add your feedback	Feb 2, 2023 at 5:36PM (UTC)

2 Ignored Deployments

Name	Status	Preview	Comments	Updated
explorer-storybook	⬜️ Ignored (Inspect)			Feb 2, 2023 at 5:36PM (UTC)
wallet-adapter	⬜️ Ignored (Inspect)			Feb 2, 2023 at 5:36PM (UTC)