feat(curriculum): css picasso painting (#42436)

* feat: generating steps

- Steps 1-32 done.
- Steps 33-80 done.
- Instructions 1-26 done.
- Instructions 27-61 done.
- More steps.
- Instructions 62-88 done.
- Clarify instructions for new concepts.
- build fixes
- Audit instructions on live site.

* fix: add helpCategory

* feat: write tests

* feat: add intro

* chore: use the right selectors

Co-authored-by: gikf <60067306+gikf@users.noreply.github.com>

* chore: cannot read property Shaun of undefined :)

Co-authored-by: Shaun Hamilton <shauhami020@gmail.com>

* feat: Shau-ptional chaining

* chore: apply shaun's review suggestions

Co-authored-by: Shaun Hamilton <shauhami020@gmail.com>

* fix: uncross my wires

* chore: apply shaun's review suggestions

Co-authored-by: Shaun Hamilton <shauhami020@gmail.com>

Co-authored-by: gikf <60067306+gikf@users.noreply.github.com>
Co-authored-by: Shaun Hamilton <shauhami020@gmail.com>

utils/preformatted-block-names.json

@@ -21,6 +21,7 @@
   "basic-html-cat-photo-app": "HTML Cat Photo App",
   "basic-css-cafe-menu": "CSS Cafe Menu",
   "css-variables-skyline": "CSS Variables Skyline",
+  "css-picasso-painting": "CSS Picasso Painting",
   "javascript-spreadsheet": "JavaScript Spreadsheet",
   "intermediate-javascript-calorie-counter": "Intermediate JavaScript Calorie Counter",
   "d3-dashboard": "D3 Dashboard"