Show version number on the initial login page

[jacobburrell]

Is your feature request related to a problem? Please describe.
It should be readily apparent what version of Traccar a server is running.

Describe the solution you'd like
Add a simple label at the bottom right-hand corner showing the version of traccar

Describe alternatives you've considered
Requiring the user to login or only show the information to admins, making the information private by default with the setting/option to display it.

Additional context

[tananaev]

Why do you need the version number?

[dough29]

You should never tell bad people what version of software you are running

[tananaev]

Our software is open source, so it's trivial to find out the version for someone who knows what they're doing, even if we don't include the number.

[harshanasrimal]

@jacobburrell I hope this implementation works for you.