Mono repo -> Master (#22553)

Combines the following repositories into one:

https://github.com/mattermost/mattermost-server
https://github.com/mattermost/mattermost-webapp
https://github.com/mattermost/focalboard
https://github.com/mattermost/mattermost-plugin-playbooks

server/templates/partials/cloud_laptop_warning.mjml

@@ -0,0 +1,5 @@
+<mj-section padding-top="0px" border-left="1px solid #E5E5E5" border-right="1px solid #E5E5E5">
+  <mj-column padding="0px">
+    <mj-image src="{{.Props.SiteURL}}/static/images/cloud-laptop-warning.png" width="320px" padding="0px" />
+  </mj-column>
+</mj-section>