Improve Edit Teams UI

[saranshgrover]

Related: #4430

The UI for editing teams is quite non-trivial and tricky as the text above it mentions. While most leaders would know how to, and can be trusted to make sure it works well - its still a good idea to make the UI more easy to understand, and less prone to errors.

[Jambrose777]

One recommendation I have for this is to distinguish 2 different types of edits: update and a fix.

• A fix is correcting data (Ie the start date of someone is wrong)
• An update is a change in someones position on the team (being added to the team, senior and leader promotion in the team, and demotions)

Maybe a branching pattern of saying what you want to do as there are a finite amount of things that a leader would need to do.

Also a quick side note: The current UI does not support deleting. I personally support not allowing this action as our history is kept in the teams tables, and reserving this for admins only. But it is a point of discussion if someone has arguments for it.