Adapting and improving orginal VFSBot script by @hnavidan

[jeromin]

• add undetected_chromedriver
• add a second independent ajax check
• split code into smaller functions
• improved original appointment check to avoid false alarm when connexion is slow or website buggy
• improved efficient by keeping browser instance open all along
• add non headless mode via script option
• Fix telegram commands (/quit and re-start and added /check on-demand
• complete logging in terminal and in telegram

Still not perfect 💪🏽