chore: add notice about atuin on MOTD (#2089)

Co-authored-by: Jorge O. Castro <jorge.castro@gmail.com>

system_files/silverblue/usr/share/ublue-os/motd/bluefin.md

@@ -9,7 +9,8 @@
 | `ujust bluefin-cli` | Enable terminal bling | 
 | `brew help` | Manage command line packages | 
 
-%TIP%
+<!-- %TIP% -->
+There's been an update: please run `ujust bluefin-cli` and disable and reenable bluefin-cli
 
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 - **󰈙** [Documentation](http://docs.projectbluefin.io/)