Feat: add new Markdown parser (#39800)

and change all the challenges to new `md` format.

curriculum/challenges/english/10-coding-interview-prep/rosetta-code/fizzbuzz.md

@@ -1,53 +1,65 @@
 ---
-title: FizzBuzz
 id: 5e9ddb06ec35240f39657419
+title: FizzBuzz
 challengeType: 5
 forumTopicId: 385370
 ---
 
-## Description
-<section id='description'>
+# --description--
 
 Write a program that generates an array of integers from 1 to 100 (inclusive). But:
+
 <ul>
     <li>for multiples of 3, add <code>"Fizz"</code> to the array instead of the number</li>
     <li>for multiples of 5, add <code>"Buzz"</code> to the array instead of the number</li>
     <li>for multiples of 3 and 5, add <code>"FizzBuzz"</code> to the array instead of the number</li>
 </ul>
 
-</section>
-## Instructions
-<section id='instructions'>
+# --instructions--
 
 Your program should return an array containing the results based on the rules above.
-</section>
 
-## Tests
-<section id='tests'>
+# --hints--
 
-```yml
-tests:
-  - text: <code>fizzBuzz</code> should be a function.
-    testString: assert(typeof fizzBuzz=='function');
-  - text: <code>fizzBuzz()</code> should return an Array.
-    testString: assert(Array.isArray(fizzBuzz())==true);
-  - text: Numbers divisible by only 3 should return <code>"Fizz"</code>.
-    testString: assert.equal(fizzBuzz()[2], "Fizz");
-  - text: Numbers divisible by only 5 should return <code>"Buzz"</code>.
-    testString: assert.equal(fizzBuzz()[99], "Buzz");
-  - text: Numbers divisible by both 3 and 5 should return <code>"FizzBuzz"</code>.
-    testString: assert.equal(fizzBuzz()[89], "FizzBuzz");
-  - text: Numbers not divisible by either 3 or 5 should return the number itself.
-    testString: assert.equal(fizzBuzz()[12], 13);
+`fizzBuzz` should be a function.
 
+```js
+assert(typeof fizzBuzz == 'function');
 ```
 
-</section>
+`fizzBuzz()` should return an Array.
 
-## Challenge Seed
-<section id='challengeSeed'>
+```js
+assert(Array.isArray(fizzBuzz()) == true);
+```
 
-<div id='js-seed'>
+Numbers divisible by only 3 should return `"Fizz"`.
+
+```js
+assert.equal(fizzBuzz()[2], 'Fizz');
+```
+
+Numbers divisible by only 5 should return `"Buzz"`.
+
+```js
+assert.equal(fizzBuzz()[99], 'Buzz');
+```
+
+Numbers divisible by both 3 and 5 should return `"FizzBuzz"`.
+
+```js
+assert.equal(fizzBuzz()[89], 'FizzBuzz');
+```
+
+Numbers not divisible by either 3 or 5 should return the number itself.
+
+```js
+assert.equal(fizzBuzz()[12], 13);
+```
+
+# --seed--
+
+## --seed-contents--
 
 ```js
 function fizzBuzz() {
@@ -55,12 +67,7 @@ function fizzBuzz() {
 }
 ```
 
-</div>
-
-</section>
-
-## Solution
-<section id='solution'>
+# --solutions--
 
 ```js
 function fizzBuzz() {
@@ -82,5 +89,3 @@ function fizzBuzz() {
     return res;
 }
 ```
-
-</section>