fix: add og:image url to index

[dylandepass]

Please always provide the GitHub issue(s) your PR is for, as well as test URLs where your change can be observed (before and after):

Fix #

Test URLs:

• Before: https://main--helix-tools-website--adobe.hlx.live/
• After: https://sidekick-query-index--helix-tools-website--adobe.hlx.live/

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Commits

* [98c2657](https://github.com/adobe/helix-tools-website/commit/98c265787ea748e45dcdd1740836d36fb1ca6fcf) :white_check_mark: (latest) * [b6578de](https://github.com/adobe/helix-tools-website/commit/b6578ded6bb75379ef47077e604b40ea9022f872) :white_check_mark:

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