CI/infra/admin improvements - 2024/03 to 05

[chalin]

• Upgrade Docsy, and Hugo to 0.123+ #4093
• [CI] Address PR-action workflow submodule problem: commit not found #4228
• [CI] GH actions warning: EBADENGINE Unsupported engine #4234
• Normalize vendors.yaml, and don't spell-check it #4238
• Upgrade to Hugo 0.125.4 + temp template #4392
• [CI] Hugo serve to/from memory, as was the case before #4437
• [infra] Fix spec markdown link processing #4445
• [infra] Hugo config clean up and NPM script adjustments #4498
• [CI] Add fix:text script, and rule for bytecode spelling #4564
• [CI] [Java agent] Ensure pkg versions get updated under zero-code #4569
• CODEOWNERS: sort entries #4575
• [CI] Update NPM packages including prettier and Hugo #4583
• [CI] Add script to update NPM pkgs to latest, and update them #4595
• [CI] Script to help know if localized pages need updating #4599
• [i18n & CI] Add default_lang_commit to front matter of all non en pages #4612
• [CI] Upgrade all NPM pksg, gulp to v5, add check-markdown wrapper as workaround #4233
• [CI] Cleanup of adjust-pages.pl script #4672
• Define and enforce a policy for introducing redirects when site pages are deleted #668
• Make build and CI more contributor friendly #2448
• CI: refcache update policy and cron-job proposal #2554 - or at least document the currently manual process
• Adjust to move Semantic Conventions out of OTel spec #2721 - unsure if there's anything left to do
• Post specs update: address 404s and reenabled all checks #3392
• [CI] Clean out page-local dictionnaires #3759
• [CI] Support htmltest config from doc-page front matter #3889
• [CI] Warning about links with inappropriate text like "here" #3898
• [CI/textlint] Enforce "autoinstrument*" as a single word #3904
• [CI] Check links in README etc #3920
• The "Create documentation issue" should add more context to generated issue #3934
• [CI] check links to resources in OTel org repos #3994

Other:

• CI/infra CI & infrastructure in particular see if any of the older issues can be closed.
• [infra] Consider identifying the source of JSBUILD failure Could not resolve "path" #3737
• [CI] Enforce capitalization of Collector? #3411
• Carried over from CI improvements - 2023/10 #3218:
  • [CI] Consider adding a "fix all" PR action #3117
  • [CI] Refactor/rework custom trim-code-block-and-unindent markdownlint rule #3183
  • Consider saving the generated website using the artifact action, and passing that along to the link checker