Add a process file

See merge request !5

    Default value is localhost, it can be changed with the configuration file
    or with an environment variable

Adapt README and Gitlab CI accordingly

    Add several tests about image sharing

    Fix bug on lqdn name depending on the social network used

    It currently only test the i18n functions

       Small and very small versions have to be updated

    Sharing URL management has been rewritten has a class

    Non-alphanum characters resulted into a truncated tweet