GH-46956: [Docs][CI] Enable version switcher in local and PR preview build #46957
+17
−1
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Rationale for this change
Currently, the version switcher is not functional in local builds or in PR preview docs via crossbow, since it relies on the versions.json file from the arrow site.
This makes it difficult to test changes to the switcher configuration or verify that nothing breaks with new theme updates.
What changes are included in this PR?
The version switcher is enabled in a dev setup by:
Are these changes tested?
Yes, preview-docs build.
Are there any user-facing changes?
No, only local testing is simplified.