GNOME dependable installation, structure and style improvements

Split utils in utils.py to a directory
Moved ./gnome-shell_css/ to ./gnome-shell/.css/

scripts/utils/remove_files.py

@@ -0,0 +1,48 @@
+# TODO: Less verbose output for the user and simplify the code
+
+from .. import config
+import os
+
+def remove_files():
+    """
+    Delete already installed Marble theme
+    """
+
+    paths = (config.themes_folder, "~/.local/share/themes")
+
+    print("💡 You do not need to delete files if you want to update theme.\n")
+
+    confirmation = input(f"Do you want to delete all \"Marble\" folders in {' and in '.join(paths)}? (y/N) ").lower()
+
+    if confirmation == "y":
+        for path in paths:
+
+            # Check if the path exists
+            if os.path.exists(os.path.expanduser(path)):
+
+                # Get the list of folders in the path
+                folders = os.listdir(os.path.expanduser(path))
+
+                # toggle if folder has no marble theme
+                found_folder = False
+
+                for folder in folders:
+                    if folder.startswith("Marble"):
+                        folder_path = os.path.join(os.path.expanduser(path), folder)
+                        print(f"Deleting folder {folder_path}...", end='')
+
+                        try:
+                            os.system(f"rm -r {folder_path}")
+
+                        except Exception as e:
+                            print(f"Error deleting folder {folder_path}: {e}")
+
+                        else:
+                            found_folder = True
+                            print("Done.")
+
+                if not found_folder:
+                    print(f"No folders starting with \"Marble\" found in {path}.")
+
+            else:
+                print(f"The path {path} does not exist.")