Demodocs: Remove duplicate admonitions

demo_docs/source/demo.rst

@@ -501,6 +501,8 @@ Admonitions
    - Back up your data.
 
 .. Note:: This is a note.
+   Equations within a note:
+   :math:`G_{\mu\nu} = 8 \pi G (T_{\mu\nu}  + \rho_\Lambda g_{\mu\nu})`.
 
 .. Tip:: 15% if the service is good.
 

demo_docs/source/index.rst

@@ -225,26 +225,6 @@ Code with Sidebar
     :linenos:
     :lines: 1-40
 
-Boxes
-=====
-
-.. tip::
-    Equations within a note
-    :math:`G_{\mu\nu} = 8 \pi G (T_{\mu\nu}  + \rho_\Lambda g_{\mu\nu})`.
-
-.. note::
-    Equations within a note
-    :math:`G_{\mu\nu} = 8 \pi G (T_{\mu\nu}  + \rho_\Lambda g_{\mu\nu})`.
-
-.. danger::
-    Equations within a note
-    :math:`G_{\mu\nu} = 8 \pi G (T_{\mu\nu}  + \rho_\Lambda g_{\mu\nu})`.
-
-.. warning::
-    Equations within a note
-    :math:`G_{\mu\nu} = 8 \pi G (T_{\mu\nu}  + \rho_\Lambda g_{\mu\nu})`.
-
-
 Inline code and references
 ==========================