🐛 Change favicon rewrite to be build-time

[rowanc1]

When loading the config.json to locate the favicon, we are preparing URLs to be resolved in the statically built context. However, we're consuming the links at build time, so we should not do this.
-- @agoose77

[changeset-bot]

🦋 Changeset detected

Latest commit: fac1f6e

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

This PR includes changesets to release 14 packages

Name	Type
@myst-theme/article	Patch
@myst-theme/book	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-to-react	Patch
myst-demo	Patch

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