fix(iot-hub): add descriptive alt text to hero cluster images#535
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Summary
The six IoT Hub hero cluster images used empty
alt="", which the Ahrefs SEO audit flagged as missing alt text. This adds a descriptive per-category alt string to each image, consistent with the earlier alt-text fixes in #531 / #533.Changes
altfield to eachhighlightsentry.<img>now rendersalt={alt}instead ofalt="".The parent
<div>keepsaria-hidden="true", so these decorative, auto-cycling background images remain hidden from screen readers while the crawler now sees non-empty alt text.