Feat: add new Markdown parser (#39800)

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

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

@@ -1,61 +1,63 @@
 ---
-title: Identity matrix
 id: 5a23c84252665b21eecc7eb1
+title: Identity matrix
 challengeType: 5
 forumTopicId: 302290
 ---
 
-## Description
-<section id='description'>
-An <i>identity matrix</i> is a square matrix of size \( n \times n \), where the diagonal elements are all <code>1</code>s (ones), and all the other elements are all <code>0</code>s (zeroes).
+# --description--
+
+An *identity matrix* is a square matrix of size \\( n \\times n \\), where the diagonal elements are all `1`s (ones), and all the other elements are all `0`s (zeroes).
+
 <ul>
-  <li style="list-style: none;">\(\displaystyle I_{n}=\begin{bmatrix} 1 & 0 & 0 \cr 0 & 1 & 0 \cr 0 & 0 & 1 \cr \end{bmatrix}\)</li>
+  <li style='list-style: none;'>\(\displaystyle I_{n}=\begin{bmatrix} 1 &#x26; 0 &#x26; 0 \cr 0 &#x26; 1 &#x26; 0 \cr 0 &#x26; 0 &#x26; 1 \cr \end{bmatrix}\)</li>
 </ul>
-</section>
 
-## Instructions
-<section id='instructions'>
-Write a function that takes a number <code>n</code> as a parameter and returns the identity matrix of order \( n \times n \).
-</section>
+# --instructions--
 
-## Tests
-<section id='tests'>
+Write a function that takes a number `n` as a parameter and returns the identity matrix of order \\( n \\times n \\).
 
-```yml
-tests:
-  - text: <code>idMatrix</code> should be a function.
-    testString: assert(typeof idMatrix=='function');
-  - text: <code>idMatrix(1)</code> should return an array.
-    testString: assert(Array.isArray(idMatrix(1)));
-  - text: <code>idMatrix(1)</code> should return <code>[ [ 1 ] ]</code>.
-    testString: assert.deepEqual(idMatrix(1),results[0]);
-  - text: <code>idMatrix(2)</code> should return <code>[ [ 1, 0 ], [ 0, 1 ] ]</code>.
-    testString: assert.deepEqual(idMatrix(2),results[1]);
-  - text: <code>idMatrix(3)</code> should return <code>[ [ 1, 0, 0 ], [ 0, 1, 0 ], [ 0, 0, 1 ] ]</code>.
-    testString: assert.deepEqual(idMatrix(3),results[2]);
-  - text: <code>idMatrix(4)</code> should return <code>[ [ 1, 0, 0, 0 ], [ 0, 1, 0, 0 ], [ 0, 0, 1, 0 ], [ 0, 0, 0, 1 ] ]</code>.
-    testString: assert.deepEqual(idMatrix(4),results[3]);
+# --hints--
 
-```
-
-</section>
-
-## Challenge Seed
-<section id='challengeSeed'>
-
-<div id='js-seed'>
+`idMatrix` should be a function.
 
 ```js
-function idMatrix(n) {
-
-}
+assert(typeof idMatrix == 'function');
 ```
 
-</div>
+`idMatrix(1)` should return an array.
 
+```js
+assert(Array.isArray(idMatrix(1)));
+```
 
-### After Test
-<div id='js-teardown'>
+`idMatrix(1)` should return `[ [ 1 ] ]`.
+
+```js
+assert.deepEqual(idMatrix(1), results[0]);
+```
+
+`idMatrix(2)` should return `[ [ 1, 0 ], [ 0, 1 ] ]`.
+
+```js
+assert.deepEqual(idMatrix(2), results[1]);
+```
+
+`idMatrix(3)` should return `[ [ 1, 0, 0 ], [ 0, 1, 0 ], [ 0, 0, 1 ] ]`.
+
+```js
+assert.deepEqual(idMatrix(3), results[2]);
+```
+
+`idMatrix(4)` should return `[ [ 1, 0, 0, 0 ], [ 0, 1, 0, 0 ], [ 0, 0, 1, 0 ], [ 0, 0, 0, 1 ] ]`.
+
+```js
+assert.deepEqual(idMatrix(4), results[3]);
+```
+
+# --seed--
+
+## --after-user-code--
 
 ```js
 let results=[[ [ 1 ] ],
@@ -64,23 +66,22 @@ let results=[[ [ 1 ] ],
 [ [ 1, 0, 0, 0 ], [ 0, 1, 0, 0 ], [ 0, 0, 1, 0 ], [ 0, 0, 0, 1 ] ]]
 ```
 
-</div>
-
-</section>
-
-## Solution
-<section id='solution'>
-
+## --seed-contents--
 
 ```js
 function idMatrix(n) {
-	return Array.apply(null, new Array(n)).map(function (x, i, xs) {
-		return xs.map(function (_, k) {
-			return i === k ? 1 : 0;
-		})
-	});
-}
 
+}
 ```
 
-</section>
+# --solutions--
+
+```js
+function idMatrix(n) {
+    return Array.apply(null, new Array(n)).map(function (x, i, xs) {
+        return xs.map(function (_, k) {
+            return i === k ? 1 : 0;
+        })
+    });
+}
+```