🎩 Fix landing-page block class lookup

[agoose77]

Simples!

[changeset-bot]

🦋 Changeset detected

Latest commit: 98b3722

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

This PR includes changesets to release 15 packages

Name	Type
@myst-theme/landing-pages	Patch
@myst-theme/providers	Patch
@myst-theme/frontmatter	Patch
@myst-theme/diagrams	Patch
@myst-theme/jupyter	Patch
@myst-theme/site	Patch
@myst-theme/styles	Patch
@myst-theme/common	Patch
@myst-theme/icons	Patch
@myst-theme/search	Patch
@myst-theme/search-minisearch	Patch
@myst-theme/book	Patch
@myst-theme/article	Patch
myst-to-react	Patch
myst-demo	Patch

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