refactor: clean up .gitignore, remove unused scripts

.gitignore

@@ -1,9 +1,5 @@
 src/**/*.ini
-add_parent.py
-!src/util/add_parent.py
-add_pypho.py
-!src/util/add_pypho.py
-
+.data
 
 # VSCode
 .vscode

src/util/add_parent.py

@@ -1,29 +0,0 @@
-
-# add_parent.py
-# 
-# This file is part of the repo "optical-regeneration"
-# https://git.suuppl.dev/seppl/optical-regeneration.git
-# 
-# (c) Joseph Hopfmüller, 2024
-# Licensed under the EUPL
-# 
-# Full license text in LICENSE file
-
-###
-
-# copy this file into the directory where you want to use pypho
-
-import sys
-from pathlib import Path
-
-__log = []
-
-# add the dir above the one where this file lives
-__parent_dir = Path(__file__).parent
-sys.path.append(str(__parent_dir.parent))
-__log.append(f"Added '{__parent_dir.parent}' to 'PATH'")
-
-
-def show_log():
-    for entry in __log:
-        print(entry)