Topology button in Site View (#220)

* Topology button in Site View

* Add mdi icons to Topology and Close Buttons

* Fix buttons tag and class

* fixed drag & site filter

Co-authored-by: Mattijs Vanhaverbeke <mattijs.vanhaverbeke@ebo-enterprises.com>

netbox_topology_views/template_content.py

@@ -0,0 +1,15 @@
+
+from extras.plugins import PluginTemplateExtension
+from django.conf import settings
+from packaging import version
+
+NETBOX_CURRENT_VERSION = version.parse(settings.VERSION)
+
+
+class SiteButtons(PluginTemplateExtension):
+    model = 'dcim.site'
+    def buttons(self):
+        return self.render('netbox_topology_views/site_button.html')
+
+
+template_extensions = [SiteButtons]