add blog

Author: redteamrecipe

_includes/components/sidebar.html

@@ -63,8 +63,8 @@
     {{ nav_footer_custom }}
   {% else %}
     <footer class="site-footer">
-      <b>Blog</b><br>
-      <a href="https://blog.devsecopsguides.com/">blog.devsecopsguides.com</a>
+      <a href="https://blog.devsecopsguides.com/"><b>Blog</b></a>
+      <a href="https://join.slack.com/t/devsecopsguides/shared_invite/zt-1yc37gckk-zeg3jnA0GdCSYqGlFs2Ppw"><b>Slack</b></a>
     </footer>
   {% endif %}
 </div>