The email obfuscation PR (#2815) incorrectly replaced the "share via
email" link with the author's email as recipient. Sharing links have no
email address to obfuscate — they just open a mailto: with the article
URL and title prefilled.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This PR changes this by grouping the links within an object key: `Site.Data.sharing.links`. This means that sites can provide their own
`data/sharing.json` file and overwrite the `links` key, to provide links of their own links.