On Windows: changes in files not detected & fix PYTHONPATH

[Yusuprozimemet]

The flask works:

2021-09-14 12:58:14,412 - _internal.py - 127.0.0.1 - - [14/Sep/2021 12:58:14] "GET /js/lightbox2/src/css/lightbox.css HTTP/1.1" 304 -
2021-09-14 12:58:14,423 - _internal.py - 127.0.0.1 - - [14/Sep/2021 12:58:14] "GET /css/jquery.dataTables_1.10.15/jquery.dataTables.css HTTP/1.1" 304 -
2021-09-14 12:58:14,436 - _internal.py - 127.0.0.1 - - [14/Sep/2021 12:58:14] "GET /css/bootstrap.min.css HTTP/1.1" 304 -
2021-09-14 12:58:14,447 - _internal.py - 127.0.0.1 - - [14/Sep/2021 12:58:14] "GET /css/style.css HTTP/1.1" 304 -
2021-09-14 12:58:14,458 - _internal.py - 127.0.0.1 - - [14/Sep/2021 12:58:14] "GET /js/jquery.dataTables_1.10.15/jquery.dataTables.js HTTP/1.1" 304 -
2021-09-14 12:58:14,460 - _internal.py - 127.0.0.1 - - [14/Sep/2021 12:58:14] "GET /css/monokai.css HTTP/1.1" 304 -
2021-09-14 12:58:14,468 - _internal.py - 127.0.0.1 - - [14/Sep/2021 12:58:14] "GET /js/bootstrap.min.js HTTP/1.1" 304 -
2021-09-14 12:58:14,475 - _internal.py - 127.0.0.1 - - [14/Sep/2021 12:58:14] "GET /js/bootstrap-toc.js HTTP/1.1" 304 -
2021-09-14 12:58:14,485 - _internal.py - 127.0.0.1 - - [14/Sep/2021 12:58:14] "GET /js/highlight.min.js HTTP/1.1" 304 -
2021-09-14 12:58:14,486 - _internal.py - 127.0.0.1 - - [14/Sep/2021 12:58:14] "GET /js/lightbox2/src/js/lightbox.js HTTP/1.1" 304 -