Removed Wagtail Space banner from the base template. (#565)

Tests look good on staging. I'm going to go ahead and merge this.

Author: vossisboss

wagtailio/project_styleguide/templates/patterns/base_page.html

@@ -87,18 +87,6 @@
 {% endblock body_top %}
 
 {% block header %}
-    {% if '/wagtail-space' not in request.path %}
-    <!-- This content will NOT show on any URL containing /wagtail-space -->
-        {% if '/wagtail-space' not in request.path %}
-            <div class="space-banner">
-                <div class="banner-text">Join us for</div>
-                <img src="{% static 'img/WagtailSpace2025Logo.png' %}"
-                     alt="Registration banner"
-                     class="banner-image">
-                <a href="/wagtail-space-2025" class="banner-button">Learn more</a>
-            </div>
-        {% endif %}
-    {% endif %}
     {% include "patterns/includes/header.html" %}
 {% endblock header %}