readme: public-facing refresh — links up top, drop the v1-spec framing, 120-col reflowmain

Now that the repo is public: title becomes "Scrypted Viewport" with a
what-it-is intro (0.7s wake-to-video, 24fps, double-digit-ms g2g) and
up-front links to the write-up (nth.io/luke/projects/esp32-ethernet-
display), the canonical src.nth.io repo, and the GitHub mirror. The
"v1 Technical Design Specification" framing is gone (the v1/v2 script
references now read as "the script" + the plugin-conversion plan), the
Boot flow diagram is fenced, and all prose is reflowed to 120 columns
(markdown tables exempt — they can't wrap).

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