fix: decouple css-bundle from dev

[markdalgleish]

This PR makes it so that the contents of the @remix-run/css-bundle package are entirely managed by the Remix compiler rather than injecting cssBundleHref value into the package contents after reading them from disk—which we only did to support HMR when cssBundleHref used to be on the manifest but this is no longer the case. This ensures that there are no runtime errors when upgrading @remix-run/dev without upgrading @remix-run/css-bundle.

I wanted to get this change in for v2 so that this is the case for all v2.x releases.

[changeset-bot]

🦋 Changeset detected

Latest commit: a887bb8

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 18 packages

Name	Type
@remix-run/css-bundle	Patch
@remix-run/dev	Patch
create-remix	Patch
remix	Patch
@remix-run/architect	Patch
@remix-run/cloudflare	Patch
@remix-run/cloudflare-pages	Patch
@remix-run/cloudflare-workers	Patch
@remix-run/deno	Patch
@remix-run/eslint-config	Patch
@remix-run/express	Patch
@remix-run/netlify	Patch
@remix-run/node	Patch
@remix-run/react	Patch
@remix-run/serve	Patch
@remix-run/server-runtime	Patch
@remix-run/testing	Patch
@remix-run/vercel	Patch

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🤖 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!