termui: remove Initial Commit startup message

I cannot think of a good use for this.
It is not particularly informative, because it is hard to
interpret a commit sha. And less is more.
diff --git a/termui/termui.go b/termui/termui.go
index 00f7bae..0342a5e 100644
--- a/termui/termui.go
+++ b/termui/termui.go
@@ -97,9 +97,7 @@
 }
 
 func (ui *termUI) Run(ctx context.Context) error {
-	fmt.Println(`🎨 Welcome to Sketch`)
 	fmt.Println(`🌐 ` + ui.httpURL + `/`)
-	fmt.Println(`📍 Initial Commit: ` + ui.agent.InitialCommit())
 	fmt.Println(`💬 type 'help' for help`)
 	fmt.Println()