add option to execute scripts with sequencer

helpers/sequencer.py

@@ -62,6 +62,10 @@ class Actions:
     def compile_presentation():
         subprocess.run(["helpers/compile_presentation.sh"], check=True)
 
+    @staticmethod
+    def external(*args):
+        subprocess.run(args, check=True)
+
 def dispatch(action, args=[]):
     if action in dir(Actions):
         getattr(Actions, action)(*args)