docs: remove broken link to focus indicator extension (closes #2530)

Author: abfahimb

src/guide/best-practices/accessibility.md

@@ -518,7 +518,6 @@ W3C's WAI-ARIA provides guidance on how to build dynamic content and advanced us
 - Other Helpful Tools
   - [HeadingMap](https://chrome.google.com/webstore/detail/headingsmap/flbjommegcjonpdmenkdiocclhjacmbi?hl=en…)
   - [Color Oracle](https://colororacle.org)
-  - [Focus Indicator](https://chrome.google.com/webstore/detail/focus-indicator/heeoeadndnhebmfebjccbhmccmaoedlf?hl=en-US…)
   - [NerdeFocus](https://chrome.google.com/webstore/detail/nerdefocus/lpfiljldhgjecfepfljnbjnbjfhennpd?hl=en-US…)
   - [Visual Aria](https://chrome.google.com/webstore/detail/visual-aria/lhbmajchkkmakajkjenkchhnhbadmhmk?hl=en-US)
   - [Silktide Website Accessibility Simulator](https://chrome.google.com/webstore/detail/silktide-website-accessib/okcpiimdfkpkjcbihbmhppldhiebhhaf?hl=en-US)