[CI] Improvements in CI and infra 24Q2-4

[chalin]

• Update Hugo to 0.126.1, script name tweaks, and more #2000
• Upgrade to Hugo 0.125.7 #1993
• [CI] UG NPM script tweaks #2007
• Update all NPM packages to latest, add update:pkgs script and more #2034
• [infra] Upgrade all NPM packages, including Hugo to 0.131.0 #2063
• [CI] Don't check links under Windows #2064
• [CI][UG] Serve to memory and disable fast render #2066
• Update Hugo to 0.133.1, and other pkgs #2092
• [CI] Fix Netlify site-build config for Docsy and example sites #2094
• Update packages: Hugo to 0.136.5 #2106
• [CI] Ensure smoke and npm test workflows validate successful runs #1779
• [CI] Publish CHANGELOG and other top-level *.md files on the Docsy site and drop markdown-link-check #1781
• [CI] For build and smoke tests, consider using actions/upload-artifact for the generated test-site files  #1799

Other & candidates:

• CI/infra CI & infrastructure
• [infra] Document official OS/env support #1782
• Add golden tests #726

Related:

• [CI] Improvements in CI and infra 24Q1 #1780