[ADD] Getting the list of interesting events (from GitHub) and displaying a simple calendar (for now just HTML/CSS version)
[ADD] The calendar of the current month is now displayed for the user given as a param --> ?user=XXXX
[ADD] Added a start page and now the username is sanitized
[UPDATE] Now the future days are not red anymore
[FIX] Fixed an issue with the day number
[UPDATE] Removed a session_start() used for testing