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/email_footer.mjml

@@ -0,0 +1,8 @@
+<mj-section padding="0px">
+  <mj-column>
+    <mj-text css-class="emailFooter" padding="0px">
+      {{.Props.Organization}}
+      {{.Props.FooterV2}}
+    </mj-text>
+  </mj-column>
+</mj-section>