Create new base container for pre-compiled webapps. (#507)

* Create new base container for pre-compiled webapps.

* Set the webapp dir appropriately.

app/data/compose/docker-compose-fixturenet-laconic-console.yml

@@ -3,6 +3,7 @@ services:
     restart: unless-stopped
     image: cerc/laconic-console-host:local
     environment:
+      - CERC_WEBAPP_FILES_DIR=${CERC_WEBAPP_FILES_DIR:-/usr/local/share/.config/yarn/global/node_modules/@cerc-io/console-app/dist/production}
       - LACONIC_HOSTED_ENDPOINT=${LACONIC_HOSTED_ENDPOINT:-http://localhost}
     ports:
       - "80"