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>

client/utils/help-category-map.json

@@ -6,6 +6,7 @@
   "responsive-web-design-principles": "HTML-CSS",
   "css-flexbox": "HTML-CSS",
   "css-grid": "HTML-CSS",
+  "css-picasso-painting": "HTML-CSS",
   "responsive-web-design-projects": "HTML-CSS",
   "basic-javascript": "JavaScript",
   "es6": "JavaScript",