Run a build for 9.0.0 across ubiquity

[btopro]

We'll have to do this, verify it works.

• [x] push up to x / staging for additional testing
• [x] ensure new types are included in config.json

{
  "true-false-question": "@haxtheweb/multiple-choice/lib/true-false-question.js",
  "short-answer-question": "@haxtheweb/multiple-choice/lib/short-answer-question.js",
  "sorting-question": "@haxtheweb/sorting-question/sorting-question.js",
  "tagging-question": "@haxtheweb/tagging-question/tagging-question.js",
  "matching-question": "@haxtheweb/matching-question/matching-question.js",
  "mark-the-words": "@haxtheweb/mark-the-words/mark-the-words.js",
  "fill-in-the-blanks": "@haxtheweb/fill-in-the-blanks/fill-in-the-blanks.js",
  "page-anchor": "@haxtheweb/page-break/lib/page-anchor.js"
}

• [x] throw over to bill / whoever to help w/ testing
• [x] push up to elms staging to see if this is viable there (breaking changes so might not be)
• [x] push out to CDN repo if all is well (which should populate both mirrors simultaneously)
• [x] push out to fallback waxam mirror if all is well (add into ubiquity)
• [x] start updating doc pages on haxcellence for new instructional types