Move count_sourcelines.py to scripts directory

Relocated count_sourcelines.py to scripts/ for better organization. Also updated ignore_set to exclude docs-json-exporter.py from line counting.

Author: Lulalaby

count_sourcelines.py renamed to scripts/count_sourcelines.py

@@ -1,7 +1,7 @@
 import os
 
 cur_path = os.getcwd()
-ignore_set = {"__init__.py", "count_sourcelines.py"}
+ignore_set = {"__init__.py", "count_sourcelines.py", "docs-json-exporter.py"}
 
 loc_list = []