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/gnome.py

@@ -0,0 +1,32 @@
+import subprocess
+
+def gnome_version():
+    """
+    Get gnome-shell version
+    """
+
+    try:
+        output = subprocess.check_output(['gnome-shell', '--version'], text=True).strip()
+        return output.split(' ')[2]
+    except subprocess.CalledProcessError:
+        return None
+
+def apply_gnome_theme(theme=None):
+    """
+    Apply gnome-shell theme
+    :param theme: theme name
+    """
+
+    try:
+        if theme is None:
+            current_theme = subprocess.check_output(['dconf', 'read', '/org/gnome/shell/extensions/user-theme/name'], text=True).strip().strip("'")
+            if current_theme.startswith("Marble"):
+                theme = current_theme
+            else:
+                return False
+
+        subprocess.run(['dconf', 'reset', '/org/gnome/shell/extensions/user-theme/name'], check=True)
+        subprocess.run(['dconf', 'write', '/org/gnome/shell/extensions/user-theme/name', f"'{theme}'"], check=True)
+    except subprocess.CalledProcessError:
+        return False
+    return True