refactor: Remove liquid templates

[abovedave]

I noticed when working on #352 that the Liquid decency is outdated and flagged in a security issue. This PR refactors the preview site templates to use a simpler approach as we're not using any of the features Liquid provides.

[giamir]

Thanks @abovedave for the PR. I am all up for simplifying but consider that we have recently introduced liquid templates for mocking Core's layout in new Free Refills services. I don't see our usage of liquid going away any time soon.

Perhaps there is another webpack loader we can use instead of removing the liquid templates all together?
Where can I read more about the vulnerabilities of that loader?

Thank you

[abovedave]

Ah I see! I could just swap out the new Function() with the actual Liquid package and skip the unmaintained loader if we really want it? It just seemed uncessary to use liquid just for a simple layout-view setup.

This was the error:

# npm audit report

liquidjs  <10.0.0
Severity: moderate
liquidjs may leak properties of a prototype - https://github.com/advisories/GHSA-45rm-2893-5f49
No fix available
node_modules/liquidjs
  liquidjs-loader  *
  Depends on vulnerable versions of liquidjs
  node_modules/liquidjs-loader

[giamir]

It just seemed uncessary to use liquid just for a simple layout-view set

@abovedave I would like to talk to Dan before removing Liquid all together from this repo. If the new Function() approach can buy us some time and fix the vulnerability I would prefer it. Thanks 🙏

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