Writing style: short, plain README and website text

[kramsey458]

Kyler's new rule for every timbermods repo: "simplicity and elegance is effective and desirable." This PR applies it to the README, the website (docs/) and the FAQ and troubleshooting pages. It also adds the rules to CLAUDE.md.

What changed

• README: 1,843 → 1,260 words (123 → 122 lines; the old lines were very long). It is written for a player: install, set up, controls, good to know, multiplayer, trouble, removing, status, license. The three <!-- latest --> lines are unchanged, byte for byte.
• Site text: shorter sentences, each thing said once, and no internals or history. Every id, data-release* hook, download button and component is unchanged. The layout is the same.
• Status: now one statement, word for word the same in the README's Compatibility and testing and the site's What's been played note. Its meaning is unchanged: the layout and visuals have been checked in game, and the newer behavior (Copy settings, store nothing, the Apply ring, Supply mode, damaged saves, messages) hasn't been played.
• Removed: the FAQ's replay-recordings question, which is history about the old add-on.
• CLAUDE.md: adds a Writing README and website text section. The content rules and the release checklist now point to it. The preview and detector commands now use docs, not the old site folder.
• PRODUCT.md: the voice line points to those rules.

Facts corrected (checked against source/)

• Developer notes links: the footer on all five pages and the FAQ linked to blob/main/docs/DEVELOPMENT.md. The file moved to the repo root in 86e8762, so they now link to blob/main/DEVELOPMENT.md.
• Lower limits during deliveries: the home page said a lower limit that clashes with incoming deliveries "waits until they arrive". Apply actually refuses it (AllocationPlan gives "Wait for incoming deliveries to finish before lowering their limits.").
• No-JavaScript note: it said the screenshot is "at the top of this page". The screenshot is in the section above the demo.
• Demo tip: it said "Paste" and "the other building". The button is Paste allocations, and the demo has three buildings.
• README fonts: the license line named only Noto Sans. Alegreya SC is self-hosted too (OFL-Alegreya.txt).
• README unofficial line: it was missing and has been added.

Checks

• node tests/test-site.mjs: 76/76
• node --check on every docs/assets/*.js: clean
• Local links and anchors: all resolve
• Captures (capsite.py) of every page at 1440px and 390px, light and dark: overflow 0

Not played in game. Text only.

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