Consistently name edX branded elements within the LMS [OPEN-300]

lms/static/sass/base/_variables.scss

@@ -402,9 +402,9 @@ $homepage__header--background: lighten($blue, 15%);
 // IMAGES: backgrounds
 $homepage-bg-image: none;
 
-$login-banner-image: url(../images/bg-banner-account.png);
-$register-banner-image: url(../images/bg-banner-account.png);
-$passwordreset-banner-image: url(../images/bg-banner-account.png);
+$login-banner-image: url(../images/edx-background-banner-account.png);
+$register-banner-image: url(../images/edx-background-banner-account.png);
+$passwordreset-banner-image: url(../images/edx-background-banner-account.png);
 
 $video-thumb-url: '../images/homepage-hero-video-thumb.jpg';
 

lms/templates/courseware/courses.html

@@ -11,11 +11,12 @@
 <%
   course_index_overlay_text = microsite.get_value('course_index_overlay_text', _("Explore free courses from leading universities."))
 
-  # not sure why this is, but if I use static.url('images/edx_bw.png') then the HTML rendering
+  # not sure why this is, but if I use static.url('images/edx-logo-bw.png') then the HTML rendering
   # of this template goes wonky
 
   logo_file = microsite.get_value(
-    'course_index_overlay_logo_file', settings.STATIC_URL + 'images/edx_bw.png')
+    'course_index_overlay_logo_file', settings.STATIC_URL + 'images/edx-logo-bw.png'
+   )
 %>
 
   <header class="search">

lms/templates/footer.html

@@ -65,11 +65,11 @@
       <p>
         <a href="http://openedx.org/">
           ## standard powered-by logo
-          <img src="https://files.edx.org/openedx-logos/edx-openedx-logo-tag.png" alt="Powered by Open edX" width="150" height="50" />
+          <img src="https://files.edx.org/openedx-logos/openedx-logo-tag.png" alt="Powered by Open edX" width="150" height="50" />
           ## greyscale logo for dark background
-          ## <img src="https://files.edx.org/openedx-logos/edx-openedx-logo-tag-light.png" alt="Powered by Open edX" width="150" height="50" />
+          ## <img src="https://files.edx.org/openedx-logos/openedx-logo-tag-light.png" alt="Powered by Open edX" width="150" height="50" />
           ## greyscale logo for light background
-          ## <img src="https://files.edx.org/openedx-logos/edx-openedx-logo-tag-dark.png" alt="Powered by Open edX" width="150" height="50" />
+          ## <img src="https://files.edx.org/openedx-logos/openedx-logo-tag-dark.png" alt="Powered by Open edX" width="150" height="50" />
         </a>
       </p>
     </div>