- added Comment Tab Navbar
- added Statistics  & Link to Single Sport and Single Boattype

Co-authored-by: Alexander Rudolph <drblaui@users.noreply.github.com>

Connect Front- and Backend

Closes #31

See merge request swp-ws21-fahrtenbuch/team-einhorn/fahrtenbuch!25

Merge remote-tracking branch 'origin/31-connect-fronted-to-backend' into 31-connect-fronted-to-backend

- added checkin connection to Sport/Boat Model
- connected status of Boats
- show time in overview

- implemented missing logEntry Endpoints and functions /commented out delete tests
- fixed checkout title

Merge remote-tracking branch 'origin/31-connect-fronted-to-backend' into 31-connect-fronted-to-backend
- added reset Checkin