refactor: remove analytics_dir from sceptre.py

This results in .../exp/elk/ instead of .../exp/analytics/elk/ for elk-related files.
This reduces complexity a bit, and less nesting in the experiment directory.
As far as I can tell, nothing directly uses the files in the experiment directory,
beyond than the code in sceptre.py for injections.

Author: GhostofGoes

src/python/phenix_apps/apps/sceptre/sceptre.py

@@ -15,15 +15,13 @@ def __init__(self):
 
         self.eprint(self.stage)
 
-        self.startup_dir   = f"{self.exp_dir}/startup"
-        self.sceptre_dir   = f"{self.exp_dir}/sceptre"
-        self.analytics_dir = f"{self.exp_dir}/analytics"  # TODO: unused?
-        self.elk_dir       = f"{self.analytics_dir}/elk"
-
-        os.makedirs(self.startup_dir,   exist_ok=True)
-        os.makedirs(self.sceptre_dir,   exist_ok=True)
-        os.makedirs(self.analytics_dir, exist_ok=True)
-        os.makedirs(self.elk_dir,       exist_ok=True)
+        self.startup_dir = f"{self.exp_dir}/startup"
+        self.sceptre_dir = f"{self.exp_dir}/sceptre"
+        self.elk_dir     = f"{self.exp_dir}/elk"
+
+        os.makedirs(self.startup_dir, exist_ok=True)
+        os.makedirs(self.sceptre_dir, exist_ok=True)
+        os.makedirs(self.elk_dir, exist_ok=True)
 
         self.mako_path = utils.abs_path(__file__, "templates")  # type: str