usage: installation: temporarily hardcode to 1.4.2

RPi image creation is broken in CI - this at least provides valid links for the latest available RPi images.

Author: ES-Alexander

content/usage/installation.md

@@ -65,7 +65,7 @@ For developers with alternative hardware, or who would rather install over a pre
 
 <script type="text/javascript">
 async function fetchLatestReleaseInfo() {
-  const url = "https://api.github.com/repos/bluerobotics/BlueOS/releases/latest";
+  const url = "https://api.github.com/repos/bluerobotics/BlueOS/releases/tags/1.4.2";
 
   const response = await fetch(url)
   if (!response.ok) {