AES encryption with a key derived from the user password

This css class fix the location of the content of the page in the correct css-grid location, instead of leaving the content free

The logout page is loaded to clear the session because, in the case of time missmatch between the server and the client, the ression could be reset to the default time (get request before the server reach 0)

Move the calculation of the svg coordinates to the javascript page (dynamic update based upon the window possible)