restructure app state, basic server connection using inputted user info and basic mainscreen

ui/login/cmds.go

@@ -0,0 +1,11 @@
+package login
+
+import (
+	tea "github.com/charmbracelet/bubbletea"
+)
+
+type ConnectingMsg struct{}
+
+func connect() tea.Msg {
+	return ConnectingMsg{}
+}