and shebangs and make all scripts executable

build_pages.py

@@ -1,3 +1,4 @@
+#! /usr/bin/env python3
 import os
 
 PAGES = [
@@ -38,4 +39,4 @@ def main():
                 f.close()
 
 if __name__ == '__main__':
-    main()
+    main()