updating code

.gitignore

access_data.json

app.py

cache_validator.sh

constants.py

index.html

lfu_checker.py

pi_logo.png

save_mode.json

static/images/pi_logo.png

static/styles/styles.css

templates/delete.html

templates/index.html

templates/login.html

templates/more_files.html

templates/upload.html

templates/upload_fail.html

upload.py

utils.py