Link nav logo to commcare.dimagi.com for logged-out users

The logo currently links to the homepage view, which redirects
logged-out users back to the login page they are already on. Point it
at the marketing site instead, matching where the other pre-login
links go. Logged-in users keep the homepage link.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Author: kcowger

corehq/apps/hqwebapp/templates/hqwebapp/bootstrap5/base_navigation.html

@@ -24,7 +24,7 @@
     <div class="container-fluid">
       <div class="navbar-header hq-header">
         <a
-          href="{% if request|toggle_enabled:"USER_TESTING_SIMPLIFY" %}#{% else %}{% url "homepage" %}{% endif %}"
+          href="{% if request|toggle_enabled:"USER_TESTING_SIMPLIFY" %}#{% elif request.user.is_authenticated %}{% url "homepage" %}{% else %}{% prelogin_url "home" %}{% endif %}"
           class="navbar-brand"
         >
           {% if CUSTOM_LOGO_URL %}

corehq/apps/hqwebapp/tests/data/bootstrap5_diffs/hqwebapp/base_navigation.html.diff.txt

@@ -22,7 +22,7 @@
      <div class="container-fluid">
 +      <div class="navbar-header hq-header">
 +        <a
-+          href="{% if request|toggle_enabled:"USER_TESTING_SIMPLIFY" %}#{% else %}{% url "homepage" %}{% endif %}"
++          href="{% if request|toggle_enabled:"USER_TESTING_SIMPLIFY" %}#{% elif request.user.is_authenticated %}{% url "homepage" %}{% else %}{% prelogin_url "home" %}{% endif %}"
 +          class="navbar-brand"
 +        >
 +          {% if CUSTOM_LOGO_URL %}