feat: remove ENABLE_MKTG_SITE guards from navbar templates

Marketing navigation links (HOW_IT_WORKS, COURSES, SCHOOLS) are now
always rendered in the unauthenticated nav bars. marketing_link() falls
back to '#' when a URL is not configured in MKTG_URLS.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: feanil

lms/templates/header/navbar-not-authenticated.html

@@ -14,7 +14,6 @@
 %>
 
 <%
-  mktg_site_enabled = static.get_value('ENABLE_MKTG_SITE', settings.FEATURES.get('ENABLE_MKTG_SITE', False))
   courses_are_browsable = settings.FEATURES.get('COURSES_ARE_BROWSABLE')
   allows_login = not settings.FEATURES['DISABLE_LOGIN_BUTTON'] and not combined_login_and_register
   can_discover_courses = settings.FEATURES.get('ENABLE_COURSE_DISCOVERY')
@@ -23,7 +22,6 @@
 %>
 <nav class="nav-links" aria-label=${_("Supplemental Links")}>
   <div class="main">
-  % if mktg_site_enabled:
     <div class="mobile-nav-item hidden-mobile nav-item">
       <a href="${marketing_link('HOW_IT_WORKS')}">${_("How it Works")}</a>
     </div>
@@ -35,7 +33,6 @@
     <div class="mobile-nav-item hidden-mobile nav-item">
       <a href="${marketing_link('SCHOOLS')}">${_("Schools")}</a>
     </div>
-  % endif
   % if allows_login:
     % if can_discover_courses:
       <div class="mobile-nav-item hidden-mobile nav-item">

lms/templates/navigation/navbar-not-authenticated.html

@@ -11,19 +11,17 @@
 
 <ol class="left list-inline nav-global">
   <%block name="navigation_global_links">
-    % if static.get_value('ENABLE_MKTG_SITE', settings.FEATURES.get('ENABLE_MKTG_SITE', False)):
-      <li class="item nav-global-01">
-        <a class="btn" href="${marketing_link('HOW_IT_WORKS')}">${_("How it Works")}</a>
-      </li>
-      % if settings.FEATURES.get('COURSES_ARE_BROWSABLE'):
-        <li class="item nav-global-02">
-          <a class="btn" href="${marketing_link('COURSES')}">${_("Courses")}</a>
-        </li>
-      % endif
-      <li class="item nav-global-03">
-        <a class="btn" href="${marketing_link('SCHOOLS')}">${_("Schools")}</a>
+    <li class="item nav-global-01">
+      <a class="btn" href="${marketing_link('HOW_IT_WORKS')}">${_("How it Works")}</a>
+    </li>
+    % if settings.FEATURES.get('COURSES_ARE_BROWSABLE'):
+      <li class="item nav-global-02">
+        <a class="btn" href="${marketing_link('COURSES')}">${_("Courses")}</a>
       </li>
     % endif
+    <li class="item nav-global-03">
+      <a class="btn" href="${marketing_link('SCHOOLS')}">${_("Schools")}</a>
+    </li>
   </%block>
 
   <%block name="navigation_other_global_links">