Tweak caution boxes

Signed-off-by: alexmerlin <alex.merlin.1985@gmail.com>

Author: alexmerlin

theme/partials/content.html

@@ -1,6 +1,6 @@
 {# Warning message for older versions #}
 {% if page.url != '' and config.extra.current_version != Undefined and page.url[:2] != config.extra.current_version %}
-    <div class="alert alert-danger" role="alert">
+    <div class="alert alert-danger alert-caution" role="alert">
         <p class="mb-0">
             The documentation you are viewing is for an older version of this component.<br>
             <a href="{{ nav.homepage.url|url }}">Switch to the latest ({{ config.extra.current_version }}) version.</a>