Allow volunteers/admins to change a team's area + location (see database/area.ts)

[tameTNT]

I don't think there is currently a way for a team's area to be set. This is not determined by the hackers themselves as we will be using the logistic team's naming system so should be volunteer/admin functionality.

[tameTNT]

In fact, this makes me realise that you don't directly change a team's megateam at all actually. You actually need to change their area on the backend side. So, when changing megateams for a team (screen below), the user could be presented with a prompt on clicking Save to also update the area details for that team.

[tameTNT]

Further discussion today settled on adding an additional searchable dropdown for the area (restricted to selected megateam) to where the team was relocated to instead of the confirmation idea proposed above. In case a new area needs to be created (shouldn't be the case with all areas pre-determined by logistics before hacking even beings), see #58

[tameTNT]

This is also required for the initial assignment of teams to a megateam. So a None option for both the megateams and areas dropdown needs to be considered before a volunteer then assigns an area (resp. megateam) to an area.