feat: remove team member

[theodkp]

• Adds remove Teammate functionality
• Admins can remove teammates from webapp (given warning first through dialog box popup)
• Removed users will automatically become admin of a new team
• Removed users will receive an email notifying them of the removal and new team

Notes

• Attempted to create email based on format of other emails ( can be changed ofc)
• Currently doesn't update stripe

closes #135

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