docs/website: update link to mind support website

The Mind website changed more than a year ago, and the link on the
support page no longer works. Link to a different page instead.

Signed-off-by: Arnout Vandecappelle <arnout@mind.be>
Signed-off-by: Romain Naour <romain.naour@smile.fr>

docs/website/support.html

@@ -130,7 +130,7 @@
 	    <a href="https://bootlin.com/engineering/">
 	      <img src="images/bootlin-logo.png" style="max-width:200px; margin-right:40px;"/>
 	    </a>
-	    <a href="https://mind.be/services/buildroot.html">
+	    <a href="https://mind.be/about-us/#anchor-open-source">
 	      <img src="images/mind-logo.png" style="max-width:200px; margin-right:40px;"/>
 	    </a>
 	    <a href="https://www.smile.eu/en/offers/embedded-iot">