News & Updates page; Quickstart starts from the download and runs on one PC first

Yunshuang Yuanrequested to merge
feat/news-and-updates into main

Part of #3 (closed) (issue stays open until checked).

  • New News & Updates page in the menu, after Download: panels for the latest PLESTY Bench release and the four monthly reports (June–September 2026), newest first.
  • Quickstart: opens with installing PLESTY Bench from the Download page; runs the demo on one PC first (both instruments on one bench), then on two PCs.
  • Menu unchanged otherwise: drop-downs stay, Hub and Docs stay beside the logo.

The Download page's dead link and stale release list are fixed in the site generator (uni plesty-website, fix/download-page). learn/experiment/index.md is untouched here, so no conflict with !13 (merged).

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