fix(curriculum): convert all video challenges to markdown (#39189)

curriculum/challenges/english/07-scientific-computing-with-python/python-for-everybody/iterations-loop-idioms.english.md

@@ -8,14 +8,16 @@ videoId: AelGAcoMXbI
 ---
 
 ## Description
+
 <section id='description'>
 
 </section>
 
 ## Tests
+
 <section id='tests'>
 
-```yml
+````yml
 question:
   text: |
     Below is code to find the smallest value from a list of values. One line has an error that will cause the code to not work as expected. Which line is it?:
@@ -31,14 +33,14 @@ question:
     ```
   answers:
     - |
-        3
+      3
     - |
-        4
+      4
     - |
-        6
+      6
     - |
-        7
+      7
   solution: 3
-```
+````
 
 </section>

curriculum/challenges/english/07-scientific-computing-with-python/python-for-everybody/more-conditional-structures.english.md

@@ -34,13 +34,13 @@ question:
 
   answers:
     - |
-        1
+      1
     - |
-        3
+      3
     - |
-        3,4
+      3,4
     - |
-        4
+      4
     - |
       None
   solution: 3