Remove obsolete explorer nav templates / tags

wagtail/wagtailadmin/templates/wagtailadmin/shared/explorer_nav.html

@@ -1,5 +0,0 @@
-{% load wagtailadmin_tags %}
-
-<ul class="dl-menu">
-    {% include "wagtailadmin/shared/explorer_nav_child.html" %}
-</ul>

wagtail/wagtailadmin/templates/wagtailadmin/shared/explorer_nav_child.html

@@ -1,13 +0,0 @@
-{% load wagtailadmin_tags %}
-
-{% for page, children in nodes %}
-	<li {% if children %}class="has-children"{% endif %}>
-	    <a href="{% url 'wagtailadmin_explore' page.id %}" class="icon icon-folder-open-inverse">{{ page.get_admin_display_title }}</a>
-	    {% if children %}
-	        <div class="children icon icon-arrow-right"></div>
-	        <ul class="dl-submenu">
-	            {% explorer_subnav children %}
-	        </ul>
-	    {% endif %}
-	</li>
-{% endfor %}

wagtail/wagtailadmin/templatetags/wagtailadmin_tags.py

@@ -14,7 +14,7 @@ from django.utils.safestring import mark_safe
 
 from wagtail.utils.pagination import DEFAULT_PAGE_KEY, replace_page_in_query
 from wagtail.wagtailadmin.menu import admin_menu
-from wagtail.wagtailadmin.navigation import get_explorable_root_page, get_navigation_menu_items
+from wagtail.wagtailadmin.navigation import get_explorable_root_page
 from wagtail.wagtailadmin.search import admin_search_areas
 from wagtail.wagtailcore import hooks
 from wagtail.wagtailcore.models import Page, PageViewRestriction, UserPagePermissionsProxy
@@ -31,20 +31,6 @@ else:
     assignment_tag = register.assignment_tag
 
 
-@register.inclusion_tag('wagtailadmin/shared/explorer_nav.html', takes_context=True)
-def explorer_nav(context):
-    return {
-        'nodes': get_navigation_menu_items(context['request'].user)
-    }
-
-
-@register.inclusion_tag('wagtailadmin/shared/explorer_nav_child.html')
-def explorer_subnav(nodes):
-    return {
-        'nodes': nodes
-    }
-
-
 @register.simple_tag(takes_context=True)
 def menu_search(context):
     request = context['request']