fix: update broken link for Colorable (#4753)

Update broken link for Colorable in Color contrast section

Author: aroyan

content/docs/accessibility.md

@@ -404,7 +404,7 @@ Ensure that all readable text on your website has sufficient color contrast to r
 - [Everything About Color Contrast And Why You Should Rethink It](https://www.smashingmagazine.com/2014/10/color-contrast-tips-and-tools-for-accessibility/)
 - [A11yProject - What is Color Contrast](https://a11yproject.com/posts/what-is-color-contrast/)
 
-It can be tedious to manually calculate the proper color combinations for all cases in your website so instead, you can [calculate an entire accessible color palette with Colorable](https://jxnblk.com/colorable/).
+It can be tedious to manually calculate the proper color combinations for all cases in your website so instead, you can [calculate an entire accessible color palette with Colorable](https://colorable.jxnblk.com/).
 
 Both the aXe and WAVE tools mentioned below also include color contrast tests and will report on contrast errors.