improvmet: fix soultion links

Author: mihaiyoo6

index.html

@@ -27,22 +27,22 @@ <h1>Udacity A11y Course TOC</h1>
           <li>
             Focusable elements in wrong DOM order:
             <a href="lesson2-focus/02-dom-order">Problem</a> |
-            <a href="lesson2-focus/02-dom-order/index-solution.html">Solution</a>
+            <a href="lesson2-focus/02-dom-order/solution/index.html">Solution</a>
           </li>
           <li>
             Offscreen content:
             <a href="lesson2-focus/04-offscreen-content">Problem</a> |
-            <a href="lesson2-focus/04-offscreen-content/index-solution.html">Solution</a>
+            <a href="lesson2-focus/04-offscreen-content/solution/index.html">Solution</a>
           </li>
           <li>
             Radio Group:
             <a href="lesson2-focus/05-radio-group">Problem</a> |
-            <a href="lesson2-focus/05-radio-group/index-solution.html">Solution</a>
+            <a href="lesson2-focus/05-radio-group/solution/index.html">Solution</a>
           </li>
           <li>
             Modals and keyboard traps:
             <a href="lesson2-focus/07-modals-and-keyboard-traps">Problem</a> |
-            <a href="lesson2-focus/07-modals-and-keyboard-traps/index-solution.html">Solution</a>
+            <a href="lesson2-focus/07-modals-and-keyboard-traps/solution/index.html">Solution</a>
           </li>
           <li>
             Manage focus yourself:
@@ -117,17 +117,17 @@ <h1>Udacity A11y Course TOC</h1>
           <li>
             Focus styles:
             <a href="lesson6-styling/01-focus-styles/index.html">Problem</a> |
-            <a href="lesson6-styling/01-focus-styles/index-solution.html">Solution</a>
+            <a href="lesson6-styling/01-focus-styles/solution/index.html">Solution</a>
           </li>
           <li>
             Style ARIA states:
             <a href="lesson6-styling/02-style-aria-states/index.html">Problem</a> |
-            <a href="lesson6-styling/02-style-aria-states/index-solution.html">Solution</a>
+            <a href="lesson6-styling/02-style-aria-states/solution/index.html">Solution</a>
           </li>
           <li>
             Contrast Audit:
             <a href="lesson6-styling/03-contrast-audit/index.html">Problem</a> |
-            <a href="lesson6-styling/03-contrast-audit/index-solution.html">Solution</a>
+            <a href="lesson6-styling/03-contrast-audit/solution/index.html">Solution</a>
           </li>
           <li>
             Mobile Screenreader: