Fix URLs in program marketing page

Change course about page to be dynamically built and change "Enroll Now" button on courses to use the upgrade url instead of the course about url.

lms/templates/courseware/program_marketing.html

@@ -271,6 +271,8 @@ endorser_org = endorser_position.get('organization_name') or corporate_endorseme
       <% 
         course_run = course['course_runs'][0] 
         course_img = course_run.get('image')
+        course_about_url = reverse('about_course', args=[course_run['key']])
+        course_purchase_url = course_run['upgrade_url'] if course_run['upgrade_url'] else course_about_url
       %>
       <div class="row course">
         <div class="col-3 col-lg-2 course-image">
@@ -280,11 +282,11 @@ endorser_org = endorser_position.get('organization_name') or corporate_endorseme
         </div>
         <div class="col-9 col-lg-6">
           <div>
-            <a href="${course_run['course_url']}">${course_run['title']}</a>
+            <a href="${course_about_url}">${course_run['title']}</a>
           </div>
           <div>${course_run['short_description']}</div>
           <div>
-            <a href="${course_run['course_url']}">${_('Learn More')}</a>
+            <a href="${course_about_url}">${_('Learn More')}</a>
           </div>
         </div>
         <div class="col-12 col-lg-4 course-enroll">
@@ -296,7 +298,7 @@ endorser_org = endorser_position.get('organization_name') or corporate_endorseme
           % if program.get('is_learner_eligible_for_one_click_purchase') != True:
             % if course_run['is_enrollment_open'] and course_run['can_enroll'] and not course_run['is_course_ended']:
               <div>
-                <a class="btn btn-primary btn-block btn-success" href="${course_run['course_url']}about">Enroll Now</a>
+                <a class="btn btn-primary btn-block btn-success" href="${course_purchase_url}">Enroll Now</a>
               </div>
             % else:
               <div>