[Kimai] Update

[schwantuschke]

Repository URL changed to https://github.com/kimai/kimai.git Source

Also, version 2 will be released soon. Therefore, it may be necessary to revise the guide.

[nichtmax]

• Change https://github.com/kevinpapst/kimai2 to https://github.com/kimai/kimai
• Look for kimai2 and change to kimai
• remove security part
• change

  [isabellastardust kimai2]$ bin/console cache:clear --env=prod
  [isabell@stardust kimai2]$ bin/console cache:warmup --env=prod
  [isabellastardust ~]$

  to: bin/console kimai:reload -n

[nichtmax]

see #1503, all fixed ☺️