Update list of related issues

Author: dontcallmedom

_includes/related-issues/jm_tensorflowjs.html

@@ -1,4 +1,5 @@
 <div class=related><p>Related conversations on <a href='https://github.com/w3c/machine-learning-workshop/issues'>GitHub</a>:</p><ul><li><a href='https://github.com/w3c/machine-learning-workshop/issues/62'>#62 Applicability to non-browser JS environments</a></li>
 <li><a href='https://github.com/w3c/machine-learning-workshop/issues/64'>#64 Support for Float16 in JS & WASM environments</a></li>
 <li><a href='https://github.com/w3c/machine-learning-workshop/issues/66'>#66 WebGPU fitness for ML frameworks</a></li>
-<li><a href='https://github.com/w3c/machine-learning-workshop/issues/67'>#67 Protecting ML models</a></li></ul></div>
+<li><a href='https://github.com/w3c/machine-learning-workshop/issues/67'>#67 Protecting ML models</a></li>
+<li><a href='https://github.com/w3c/machine-learning-workshop/issues/68'>#68 Progressive Enhancement / Graceful degradation</a></li></ul></div>

_includes/related-issues/mod_webgpu.html

@@ -0,0 +1 @@
+<div class=related><p>Related conversations on <a href='https://github.com/w3c/machine-learning-workshop/issues'>GitHub</a>:</p><ul><li><a href='https://github.com/w3c/machine-learning-workshop/issues/66'>#66 WebGPU fitness for ML frameworks</a></li></ul></div>