Replace Layer5 Academy SVG assets and update README to reflect new image paths

Signed-off-by: Lee Calcote <lee.calcote@layer5.io>

Author: leecalcote

.github/assets/images/Layer5Academy/academy.svg

@@ -11,7 +11,7 @@
 <img src="https://img.shields.io/github/contributors/layer5io/layer5.svg" /></a>
 <a href="https://github.com/issues?q=is%3Aopen+is%3Aissue+archived%3Afalse+(org%3Alayer5io+OR+org%3Ameshery+OR+org%3Alayer5labs+OR+org%3Aservice-mesh-performance+OR+org%3Aservice-mesh-patterns+OR+org%3Ameshery-extensions)+label%3A%22help+wanted%22" alt="Help wanted GitHub issues">
 <img src="https://img.shields.io/github/issues/layer5io/layer5/help%20wanted.svg?color=%23DDDD00" /></a>
-<a href="https://slack.layer5.io" alt="Slack">
+<a href="https://slack.layer5.io" alt="S/lack">
 <img src="https://img.shields.io/badge/Slack-@layer5.svg?logo=slack" /></a>
 <a href="https://twitter.com/layer5" alt="Twitter Follow">
 <img src="https://img.shields.io/twitter/follow/layer5.svg?label=Follow+Layer5&style=social" /></a>
@@ -74,7 +74,7 @@ alt="Meshery Catalog" align="left" />
 <p style="clear:both;">
 <h2><a href="https://cloud.layer5.io/academy">Layer5 Academy</a></h2>
 <a href="https://cloud.layer5.io/academy">
- <img src=".github/assets/images/Layer5Academy/academy.svg" style="margin:10px;" width="125px" alt="Layer5 Academy" align="left" />
+ <img src=".github/assets/images/academy/academy-layer5-light.svg" style="margin:10px;" width="125px" alt="Layer5 Academy" align="left" />
 </a>
 <a href="https://cloud.layer5.io/academy">Layer5 Academy</a> Layer5 Academy is a learning platform built into Layer5 Cloud. It offers structured learning paths, interactive challenges, and professional certifications. Content spans beginner to advanced levels, helping both developers and organizations skill up in cloud native technologies.
 <br /><br /><br/>