seo: add social preview image and fix Open Graph / Twitter meta

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Link previews (LinkedIn, X, etc.) were broken: og:image pointed at a
GitHub-hosted favicon (.ico, too small, likely 404) and og:url pointed at
the GitHub repo instead of the live site.

- Add a branded 1200x630 social card at assets/og-image.png.
- Point og:url/canonical at https://securebit.chat/ and og:image at the new
  PNG via absolute URLs; add og:image:width/height/type, og:site_name,
  og:image:alt and twitter:image.
- Refresh the meta description to match the product (no longer version-stamped).

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lockbitchat committed 2026-06-24 16:00:04 -04:00

1 parent 5eaf57c8da

commit ae6900d0c7

3 files changed

+45 -38

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