log initialisation msg and headders on the init command

src/mpsd_software_manager/mpsd_software.py

@@ -1235,9 +1235,9 @@ def initialise_environment(root_dir: Path) -> None:
         # create the log file and fill it with the headers
         record_script_execution_summary(root_dir=root_dir)
         # record the msg in the log file
-        record_script_execution_summary(
+        write_to_cmd_log(
             root_dir=root_dir,
-            msg=f"Initialising MPSD software instance at {root_dir}.",
+            msg=f"Initialising MPSD software instance at {root_dir}.\n",
         )