refactor(templates): the last inline styles that Bootstrap covers

- The VM list's power forms (style="display:inline") are d-inline.
- The fields scripts show and hide are d-none, and the scripts add and
  remove that class instead of calling jQuery's show() and hide(),
  which could not undo it: the custom memory boxes of the Resize tab,
  the ISO upload's error message and the clone dialog's metadata row.
- The please-wait dialog's full bar is w-100.
- The create-VM pages' own 56rem width (.create-vm) goes: pages stop
  at 960px now, about the same.
- static/css/font-awesome.min.css goes: no page loaded it, no element
  used its classes and its fonts were never in the repository.

instances/templates/instance.html

@@ -316,7 +316,7 @@
         $('.js-custom__checkbox').change(function () {
             var container  = $(this).closest('.js-custom__container');
             var toggles    = container.find('.js-custom__toggle');
-            toggles.toggle();
+            toggles.toggleClass("d-none");
             // a custom value is sent only while its box is ticked
             container.find('input.js-custom__toggle').prop('disabled', !this.checked);
         });