Refactoring

[KimNikita]

Repo structure must be like this:
src-->
------assets-->
----------------map.html
----------------map.json
------datasets-->
----------------landsat_data_reader.py (old data_reader.py)
----------------landsat-8_downloaded
----------------sentinel-2_downloaded
------demos-->
----------------cloud_segmentation.py (old cloud_segmentation_pipeline.py)
----------------fire_detection.py (old fire_detection_pipeline.py)
------models-->
----------------cloud_net.py
----------------kumar_roy.py
------scripts-->
----------------landsat_downloader.py
----------------landsat_cropper.py (old landsat_cropper_demo.py)
----------------sentinel_downloader.py
------design.py
------main.py
------README.md