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/get_version_folder.py

@@ -0,0 +1,29 @@
+import os
+
+def get_version_folders(version, base_path):
+    """
+    Get version folders
+    :param version: gnome-shell version
+    :param base_path: base path to version folders
+    :return: list of matching version folders
+    """
+    version_folders = os.listdir(base_path)
+    version = int(version.split('.')[0])  # Use only the major version for comparison
+    matching_folders = []
+
+    for folder in version_folders:
+        if '..' in folder:
+            from_version, to_version = folder.split('..')
+            if from_version and to_version:
+                if int(from_version) <= version <= int(to_version):
+                    matching_folders.append(folder)
+            elif from_version:
+                if version >= int(from_version):
+                    matching_folders.append(folder)
+            elif to_version:
+                if version <= int(to_version):
+                    matching_folders.append(folder)
+        elif int(folder) == version:
+            matching_folders.append(folder)
+
+    return matching_folders