Fixes #671 (#677)

* Use CSRF token from window.CSRF_TOKEN

* Removed unused csrftoken.js

netbox_topology_views/static_dev/js/home.js

@@ -1,6 +1,5 @@
 import { DataSet } from 'vis-data/esnext'
 import { Network } from 'vis-network/esnext'
-import { getCookie } from './csrftoken.js'
 
 const options = {
     interaction: {
@@ -36,9 +35,6 @@ const options = {
     }
 }
 
-// Load CSRF token
-const csrftoken = getCookie('csrftoken')
-
 // Render vis graph
 let graph = null // vis graph instance
 
@@ -228,7 +224,7 @@ const coordSaveCheckbox = document.querySelector('#id_save_coords')
                         {
                             method: 'PATCH',
                             headers: {
-                                'X-CSRFToken': csrftoken,
+                                'X-CSRFToken': window.CSRF_TOKEN,
                                 Accept: 'application/json',
                                 'Content-Type': 'application/json'
                             },