Add "model index" component

at least, the beginnings of one.  a little clunky yet but seems do get the job
done...

src/components/index.js

@@ -2,10 +2,12 @@ import ByjoveApp from './app'
 import ByjoveMenu from './menu'
 import ByjoveLogo from './logo'
 import ByjoveFeedback from './feedback'
+import ByjoveModelIndex from './model-index'
 
 export {
     ByjoveApp,
     ByjoveMenu,
     ByjoveLogo,
     ByjoveFeedback,
+    ByjoveModelIndex,
 }