Cut AI-boilerplate prose from variable, module, and topic pages

[styler]

Part 2 of 3 (stacked on #94 — retarget to master after it merges).

Deletion-first pass on the machine-fingerprint prose (net −120 lines):

• Deleted the stamped Best Practices / Troubleshooting sections on variable pages (channel, user, sender, ai, time) — they restated definitions as advice, with identical sentences across pages. The one real fact each contained (e.g. unknown users → empty output, time error strings) was kept and folded into the page proper.
• Rewrote the "powerful/versatile tool" openers (~15 pages) into plain factual sentences.
• Replaced the fill-in-the-blank intros on the contests/songrequest/giveaway websocket topics ("build real-time X displays, Y interfaces, or sync X state…").
• weather: merged the duplicate "Use it"/"Usage" sections; time: collapsed five padding sections into Common errors + a 2-question FAQ.
• Deduped the identical "What happens on a violation" paragraph pasted on 9 filter pages — now one line pointing at the shared section.
• overlays/index: replaced the "Welcome… powerful Overlay Editor" boilerplate with a description of what overlays actually are.

Kept: "powerful command, use with caution" on !nuke/!nukeusername (that's a real warning), and borderline-but-human phrasing elsewhere.

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Status	Name	Latest Commit	Updated (UTC)
✅ Deployment successful! View logs	docs	2566117	Jul 18 2026, 12:07 PM