Add link-preview tags and cover to the explainer preview

- Open Graph and Twitter card tags in English on index.html and semplice.html
- cover.jpg (1200x630): the light-blue drawing with the title
- so Telegram, X and WhatsApp show title, description and image
This commit is contained in:
2026-10-23 15:53:26 +02:00
parent ca29b6ca6a
commit 240da9e71f
3 changed files with 30 additions and 2 deletions

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anteprima-2a86b5/cover.jpg Normal file

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