move to esbuild & yarn (#138)

* move to esbuild & yarn

* remove gulpfile

* cleanup unused ref

* updated gitignore

netbox_topology_views/templates/netbox_topology_views/index.html

@@ -69,7 +69,5 @@
 {% endblock content-wrapper %}
 
 {% block javascript %}
-  <script src="{% static 'netbox_topology_views/js/vendor.js' %}"></script>
 	<script src="{% static 'netbox_topology_views/js/app.js' %}"></script>
-	<script type="application/javascript">iniPlotboxIndex()</script>
 {% endblock javascript %}