Prep for Carbon Co-op / Marple energy flexibility pilot

[zarino]

• [x] update dependencies etc
• [x] Remove "create a new team" option (eg: from search results page) – we want people to search by postcode/geolocation and join the existing team near them (of which there’ll only be one: Marple)
• [x] Modify team page to include the steps we want Marple team to progress through – no need to make step progression "work", we can modify the template by hand each time
  • [ ] @zarino to confirm "steps" content
• [ ] Run through new service data protection checklist – ensure privacy policy up to date
• [ ] #79
• [ ] Create a "team" that covers the Marple area