refactor(build): place the views in the page instead of expanding templates

index.html now lists each view's host and the loading screen itself, so
the gev:template expansion plugin, its view list, the loading-screen
template and the ./build/html export are gone. createApplication takes
omitViews for views an application leaves out; their hosts are removed,
and a view an earlier call rendered is unmounted.

package.json

@@ -219,9 +219,6 @@
     "./voice/actions": "./src/voice/gevActions.js",
     "./annotations": "./src/annotations/index.js",
     "./context": "./src/data/contextStore.js",
-    "./build/html": {
-      "node": "./build/application-html.js"
-    },
     "./build/register-vue": {
       "node": "./build/registerVue.js"
     },