Headings fix

_sass/_headers.scss

@@ -30,45 +30,84 @@ h1.page-title,
 .headings-demo h1:first-child,
 .headings-demo h2:first-child,
 .headings-demo h3:first-child,
+.headings-demo h4:first-child,
+.headings-demo h5:first-child,
+.headings-demo h6:first-child,
 blockquote     h1:first-child,
 blockquote     h2:first-child,
 blockquote     h3:first-child,
 .admonition    h1:first-child,
 .admonition    h2:first-child,
 .admonition    h3:first-child,
+.admonition    h4:first-child,
+.admonition    h5:first-child,
+.admonition    h6:first-child,
 .attention     h1:first-child,
 .attention     h2:first-child,
 .attention     h3:first-child,
+.attention     h4:first-child,
+.attention     h5:first-child,
+.attention     h6:first-child,
 .caution       h1:first-child,
 .caution       h2:first-child,
 .caution       h3:first-child,
+.caution       h4:first-child,
+.caution       h5:first-child,
+.caution       h6:first-child,
 .danger        h1:first-child,
 .danger        h2:first-child,
 .danger        h3:first-child,
+.danger        h4:first-child,
+.danger        h5:first-child,
+.danger        h6:first-child,
 .error         h1:first-child,
 .error         h2:first-child,
 .error         h3:first-child,
+.error         h4:first-child,
+.error         h5:first-child,
+.error         h6:first-child,
 .important     h1:first-child,
 .important     h2:first-child,
 .important     h3:first-child,
+.important     h4:first-child,
+.important     h5:first-child,
+.important     h6:first-child,
 .warning       h1:first-child,
 .warning       h2:first-child,
 .warning       h3:first-child,
+.warning       h4:first-child,
+.warning       h5:first-child,
+.warning       h6:first-child,
 .hint          h1:first-child,
 .hint          h2:first-child,
 .hint          h3:first-child,
+.hint          h4:first-child,
+.hint          h5:first-child,
+.hint          h6:first-child,
 .tip           h1:first-child,
 .tip           h2:first-child,
 .tip           h3:first-child,
+.tip           h4:first-child,
+.tip           h5:first-child,
+.tip           h6:first-child,
 .note          h1:first-child,
 .note          h2:first-child,
 .note          h3:first-child,
+.note          h4:first-child,
+.note          h5:first-child,
+.note          h6:first-child,
 .seealso       h1:first-child,
 .seealso       h2:first-child,
 .seealso       h3:first-child,
+.seealso       h4:first-child,
+.seealso       h5:first-child,
+.seealso       h6:first-child,
 .todo          h1:first-child,
 .todo          h2:first-child,
 .todo          h3:first-child,
+.todo          h4:first-child,
+.todo          h5:first-child,
+.todo          h6:first-child,
 h1 + h1,
 h1 + h2,
 h1 + h3,