Docs: SEO, lychee hardening, custom 404, and gallery improvements#1161

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sbryngelson wants to merge 8 commits into

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sbryngelson:read-improvements

Commits on Feb 18, 2026

Add 6 new simulations to docs gallery with computer links

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Add gallery cards, SEO improvements, and per-page dates

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Add YouTube icon and target_blank to gallery card links

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Fix JSON-LD schema type and walltime format consistency

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Link scaling plot to performance page, harden lychee CI config

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Remove invalid SoftwareSourceCode properties (applicationCategory, operatingSystem)

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Exclude HPE Cray docs from lychee (broken SSL cert)

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Add custom 404 page and verify essential site files in CI

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