content: update asusctl to 6.3.4, clarify suite architecture, fix image refs

[Stensel8]

• fix: bottom navigation issues
• Bump asusctl and rog-control-center to 6.3.4
• Clarify architecture: asusd (backend daemon), asusctl (CLI frontend),
• Replace lone "Luke Jones" mentions with "asus-linux team"; link to releases page at gitlab.com/asus-linux/asusctl/-/releases
• Fix broken image reference: High-Tide.avif -> high-tide.avif (case sensitivity on Linux)
• Add missing untracked images that were already referenced in content

Summary

Type of change

• feat — new page or feature
• fix — bug fix (broken link, incorrect command, layout issue)
• content — update or improve existing content
• docs — changes to CONTRIBUTING, README, or meta documentation
• chore — maintenance (dependencies, config, CI/CD)
• refactor — restructuring without content changes
• style — formatting, whitespace, typos

Checklist

• PR title follows the commit convention (e.g. fix: correct nmcli command in eduroam guide)
• Both EN and NL versions updated (if applicable)
• Images are in AVIF format (not PNG/JPG)
• No broken image references (/images/*.avif all exist in static/images/)
• Tested locally with hugo server