Rename Font Awesome file to clarify it's a subset of the icon set

TODO.md

@@ -1,5 +1,6 @@
 # To-do
 
+* use an XML query tool to build `img/font_awesome_subset.svg`
 * rate limiting to prevent abuse - especially on POST requests
 * consider removing `events` and `worldmap` modules
 * ask Denver about why so many license files

conservancy/assignment/templates/assignment/thanks.html

@@ -3,7 +3,7 @@
 {% block category %}Copyright Assignment{% endblock %}
 {% block outercontent %}
   <div class="mw8 center ph2 ph3">
-  <h1>Thanks! <svg style="color: #ff41b4; width: 30px; height: 30px; vertical-align: middle;"><use href="{% static 'img/font_awesome.svg' %}#heart"></use></svg></h1>
+  <h1>Thanks! <svg style="color: #ff41b4; width: 30px; height: 30px; vertical-align: middle;"><use href="{% static 'img/font_awesome_subset.svg' %}#heart"></use></svg></h1>
 
   <div class="mw7 mb5">
     <p>Thank you for assigning your copyright to Software Freedom Conservancy! We have recorded the below information regarding the assignment and the works.</p>

conservancy/fossy/templates/fossy/thanks.html

@@ -16,7 +16,7 @@
 {% endblock %}
 {% block outercontent %}
   <div class="mw8 center ph2 ph3">
-  <h1>Thanks! <svg style="color: #ff41b4; width: 30px; height: 30px; vertical-align: middle;"><use href="{% static 'img/font_awesome.svg' %}#heart"></use></svg></h1>
+  <h1>Thanks! <svg style="color: #ff41b4; width: 30px; height: 30px; vertical-align: middle;"><use href="{% static 'img/font_awesome_subset.svg' %}#heart"></use></svg></h1>
 
   <div class="mw7 mb5">
     <p>Thanks very much for taking the time and effort to propose a community track. We'll get back to you as soon as we've selected the tracks. In the mean time if you have any questions, please email <a href="mailto:conference@sfconservancy.org">conference@sfconservancy.org</a>.</p>

conservancy/templates/frontpage.html

@@ -99,7 +99,7 @@ strategies that defend FOSS (such as copyleft). <a href="/about" class="orange">
 
     <h2 class="f6 ttu mt2 mb1">RSS feed</h2>
     <div class="ml2">
-      <a href="/feeds/omnibus" class="mr2"><svg class="orange" style="width: 30px; height: 30px;"><use href="{% static 'img/font_awesome.svg#rss-square' %}"></use></svg></a>
+      <a href="/feeds/omnibus" class="mr2"><svg class="orange" style="width: 30px; height: 30px;"><use href="{% static 'img/font_awesome_subset.svg' %}#rss-square"></use></svg></a>
     </div>
 
     <h2 class="f6 ttu mt2 mb1">Follow us</h2>