[FEATURE] Promotion history

[tiriana]

Is your feature request related to a problem? Please describe. No

Describe the solution you'd like

I'd like to be able to define multiple positions under a single Company entry

Describe alternatives you've considered

This could probably be achieved by some markdown formatting

Additional context

This is a duplicate of https://github.com/AmruthPillai/Reactive-Resume/issues/1000 with a small improvement to the description to follow the code of conduct.