Create change_logo_dashboard.rst

docs/howto/change_logo_dashboard.rst

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+Change Logo in Dashboard
+========================
+
+In your projects with Wagtail, maybe need switch the default logo to other image. For this, you need override the block ``logo_admin``.
+
+    {% extends "wagtailadmin/base.html" %}
+    
+    {% block admin_logo %}
+        <img src="{{ STATIC_URL }}images/custom-logo.svg" alt="Custom Project" width="80" />
+    {% endblock %}
+    
+
+Save this in your app, for example, ``dashboard`` to ``dashboard/templates/wagtailadmin/base.html`` and register before ``wagtailadmin``::
+
+    INSTALLED_APPS = (
+      # ...
+      
+      'dashboard',
+      
+      'wagtail.wagtailcore',
+      'wagtail.wagtailadmin',
+      
+      # ...
+    )