New component to search senior (see #12). Enhance responsiveness and solve #10 and #11

Camelize data and insert react-hook-form in autocomplete.

See merge request !58

May be integrated in future in getSeniorList.

The correct data is not currently displayed because the retourned object
needs to be camelIzed.

Replace context with api.

See merge request !57

The return data of this hooks needs to be polished when AuthContext will
be removed.

This keeps the user logged in after tab closing, since state is stored
in the server.