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_w1.html

@@ -5,17 +5,13 @@
 
 {% block title %}{% trans "Create new instance" %} - {% trans "Machine" %}{% endblock %}
 
-{% block style %}
-    <style>.create-vm { max-width: 56rem; }</style>
-{% endblock %}
-
 {% block page_heading%}
 {% blocktrans with host=compute.name %}New instance on {{ host }} {% endblocktrans %}
 {% endblock page_heading %}
 
 {% block content %}
     {% include 'pleasewaitdialog.html' %}
-    <div class="create-vm mx-auto">
+    <div>
         {% include "create_steps.html" with step=2 %}
 
         <section class="card mb-3" aria-labelledby="machine-heading">