build(dev): remove unused create-remix externals

[markdalgleish]

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[github-actions]

🤖 Hello there,

We just published version v0.0.0-nightly-7cb1e7e-20230803 which includes this pull request. If you'd like to take it for a test run please try it out and let us know what you think!

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[github-actions]

🤖 Hello there,

We just published version 1.19.2-pre.2 which includes this pull request. If you'd like to take it for a test run please try it out and let us know what you think!

Thanks!

[github-actions]

🤖 Hello there,

We just published version v0.0.0-nightly-6e250f7-20230805 which includes this pull request. If you'd like to take it for a test run please try it out and let us know what you think!

Thanks!

[github-actions]

🤖 Hello there,

We just published version v0.0.0-nightly-a179aa7-20230809 which includes this pull request. If you'd like to take it for a test run please try it out and let us know what you think!

Thanks!

[github-actions]

🤖 Hello there,

We just published version v0.0.0-nightly-b1149bb-20230810 which includes this pull request. If you'd like to take it for a test run please try it out and let us know what you think!

Thanks!