[exoframe-website] Document that upgrade will need to run twice

Author: yamalight

packages/exoframe-website/docs/migrating/6-to-7.md

@@ -6,6 +6,7 @@ sidebar_position: 1
 
 ## TL;DR
 
+- When upgrading to v7 - you will have to run `exoframe update` twice - first to update server to latest version, then to let server upgrade Traefik to v3 (Exoframe v6 only upgraded to latest v2).
 - Exoframe CLI now required `deploy` subcommand to be explicitly passed. So, instead of `exoframe [-u] [folder]` you'd have to do `exoframe deploy [-u] [folder]`
 - Config for both Exoframe CLI and Exoframe Server is now located under `$XDG_CONFIG_HOME/exoframe` instead of `$HOME/.exoframe`
 - Traefik update to v3