fix: adjust startup scripts to allow relative path for kubeconfig

[qdzlug]

Is your feature request related to a problem? Please describe.
We currently force the user to enter an absolute path due to potential edge case issues. We should allow a relative path, but we should also expand the path out before we write it to the configuration.

Describe the solution you'd like
Expand path and write the absolute path to config.

Describe alternatives you've considered
Currently, we force an absolute path.

Additional context
This will obviously need to be investigated further just to make sure we're not causing a problem.