docs(landing): console nav, install sheet, and Pages SEO

[klebertiko]

Summary

• Swap the still-rendered pill nav for the lighting-console mast (square cells, --live spine, Studio/Luz/Efeitos/Cenas, left rail on mobile).
• Mast and hero Baixar open the same install popover (PowerShell irm | iex / Git Bash curl | bash, no zip, no jump to a download band).
• Raise the RGB follow-spot above opaque sections and add Pages SEO/agent files (robots, sitemap, llms.txt, index.md, JSON-LD, read-only WebMCP tools).

Test plan

• Desktop: square console, not a pill; Baixar opens commands in place (scroll stays 0)
• Mobile ~375px: fader toggle opens left rail; no horizontal scroll; copy wraps
• Rail section click hides the popover
• Follow-spot z-index: 5 / mix-blend-mode: screen above main
• Live GitHub Pages after merge: https://klebertiko.github.io/NightwolfRGB/

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