chore: rename picasso painting (#44209)

* chore: rename files

* chore: update codebase

* chore: proper title case

Co-authored-by: Tom <20648924+moT01@users.noreply.github.com>

curriculum/challenges/_meta/learn-intermediate-css-by-building-a-picasso-painting/meta.json

@@ -1,8 +1,8 @@
 {
-  "name": "CSS Picasso Painting",
+  "name": "Learn Intermediate CSS by Building a Picasso Painting",
   "isUpcomingChange": true,
   "usesMultifileEditor": true,
-  "dashedName": "css-picasso-painting",
+  "dashedName": "learn-intermediate-css-by-building-a-picasso-painting",
   "order": 11,
   "time": "5 hours",
   "template": "",