Switch back to a versionless cache folder for content repositories
The cache folder used for content repositories was versioned in Antora 2 (i.e., content/2
) since Antora could not reuse the cached content repositories generated by Antora 1 (which used a different git client). Antora will now recreated the cached repository if it cannot use it (and Antora 1 is now EOL), so there's no reason to version the cache folder anymore. Drop the version number folder from the cache directory path for content.