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_keywords.py

@@ -0,0 +1,15 @@
+def remove_keywords(file, *args):
+    """
+    Remove keywords from a file
+    :param file: file name
+    :param args: keywords to remove
+    """
+
+    with open(file, "r") as read_file:
+        content = read_file.read()
+
+        for arg in args:
+            content = content.replace(arg, "")
+
+    with open(file, "w") as write_file:
+        write_file.write(content)