Replace js-url with wurl

js-url is outdated and wurl is it's successor. This will fix some
vulnerabilities in the dependencies and also optimize the build process
by removing the external library toward internal tooling.

Signed-off-by: Sheogorath <sheogorath@shivering-isles.com>

public/js/index.js

@@ -17,6 +17,7 @@ import { saveAs } from 'file-saver'
 import randomColor from 'randomcolor'
 import store from 'store'
 import hljs from 'highlight.js'
+import url from 'wurl'
 
 import _ from 'lodash'
 
@@ -1373,12 +1374,12 @@ $('#gistImportModalConfirm').click(function () {
   if (!isValidURL(gisturl)) {
     showMessageModal('<i class="fa fa-github"></i> Import from Gist', 'Not a valid URL :(', '', '', false)
   } else {
-    var hostname = window.url('hostname', gisturl)
+    var hostname = url('hostname', gisturl)
     if (hostname !== 'gist.github.com') {
       showMessageModal('<i class="fa fa-github"></i> Import from Gist', 'Not a valid Gist URL :(', '', '', false)
     } else {
       ui.spinner.show()
-      $.get('https://api.github.com/gists/' + window.url('-1', gisturl))
+      $.get('https://api.github.com/gists/' + url('-1', gisturl))
                 .done(function (data) {
                   if (data.files) {
                     var contents = ''