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/create_instance_w2.html

@@ -13,7 +13,6 @@
     <style>
         /* the chosen images and networks are listed below the pickers, not in them */
         #image-control + .ts-wrapper .ts-control > .item, #network-control + .ts-wrapper .ts-control > .item { display: none; }
-        .create-vm { max-width: 56rem; }
         .source-option { cursor: pointer; }
         /* the chosen card by its border only: the Bootswatch dark themes keep light "subtle" backgrounds */
         .source-option:has(input:checked) { border-color: var(--bs-primary) !important; box-shadow: inset 0 0 0 1px var(--bs-primary); }
@@ -27,7 +26,7 @@
 
 {% block content %}
     {% include 'pleasewaitdialog.html' %}
-    <div class="create-vm mx-auto">
+    <div>
         {% include "create_steps.html" with step=3 %}
 
         {% if vm_form %}