docs: break up dense paragraphs in github-screenshots skill

[Zach Dunn (zachdunn)]

Applies the docs restructure (#847) scannability treatment to the github-screenshots skill. Same failure mode the docs pass targeted: a bold lead-in followed by a 5–6 line run-on glued with em-dashes.

Formatting only — every command, flag, and caveat is preserved.

• Step 1 — dev-server flags paragraph split into a bulleted list (--no-hide-dev-tools, --reduced-motion, --hide, --eval/--init-script).
• Step 2 — broke up the four bold-lead walls: default staging loop, bound-repo auto-promote caveat, the --state/--meta path habit, and the same-URL before/after contract; led the hint note with its condition.

Left Step 1's capture examples, the comment-assembly section, and the cautions alone — those already carry their weight with code blocks and existing bullets.

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