[IMP] odoo_theme: switch admonitions' display type to inline-block

When placing an image before an admonition block and setting its
alignment to left or right, the admonition block would hide the image.
The reason for this is the use of "float" on the image. In order for
the image to reappear, we change the admonition's `display: block` to
`display: inline-block`.

task-2582954

closes odoo/documentation#1589

Signed-off-by: Antoine Vandevenne (anv) <anv@odoo.com>

extensions/odoo_theme/static/style.scss

@@ -853,7 +853,7 @@ header.o_main_header {
 // alert-success // removed : never used in doc
         .alert {
             position: relative;
-            display: block;
+            display: inline-block;
             border-radius: 0;
             border-width: 0 0 0 3px;
             @include font-size($font-size-secondary);