Create an super admins team and switch admins to moderators

[tim-schilling]

The super admins team will have admin permissions in the GitHub org while the admins team will have moderator permissions.

Closes django-commons/controls#90

We need to confirm we're not all going to lose our permissions with this change 😬

[github-actions]

Terraform plan in terraform
With var files: terraform/production/org.tfvars terraform/production/repositories.tfvars
With variables: github_token = (sensitive value)

Plan: 2 to add, 1 to change, 0 to destroy.

Terraform used the selected providers to generate the following execution
plan. Resource actions are indicated with the following symbols:
+   create
!~  update in-place

Terraform will perform the following actions:

  # github_team.org_teams["Admins"] will be updated in-place
!~  resource "github_team" "org_teams" {
!~      description               = "django-commons administrators" -> "django-commons administrators team with moderator permissions in the org."
        id                        = "9763562"
        name                      = "Admins"
#        (10 unchanged attributes hidden)
    }

  # github_team.org_teams["operations"] will be created
+   resource "github_team" "org_teams" {
+       create_default_maintainer = false
+       description               = "django-commons operations team with admin permissions in the org."
+       etag                      = (known after apply)
+       id                        = (known after apply)
+       members_count             = (known after apply)
+       name                      = "operations"
+       node_id                   = (known after apply)
+       parent_team_read_id       = (known after apply)
+       parent_team_read_slug     = (known after apply)
+       privacy                   = "closed"
+       slug                      = (known after apply)
    }

  # github_team_members.org_team_members["operations"] will be created
+   resource "github_team_members" "org_team_members" {
+       id      = (known after apply)
+       team_id = (known after apply)

+       members {
+           role     = "maintainer"
+           username = "Stormheg"
        }
+       members {
+           role     = "maintainer"
+           username = "cunla"
        }
+       members {
+           role     = "maintainer"
+           username = "ryancheley"
        }
+       members {
+           role     = "maintainer"
+           username = "tim-schilling"
        }
+       members {
+           role     = "maintainer"
+           username = "williln"
        }
    }

Plan: 2 to add, 1 to change, 0 to destroy.

📝 Plan generated in Plan org changes and list them in a PR #226

[tim-schilling]

Yeah, I think we may want to split this into two PRs. Create the ops team first, then reduce the admin team's permissions. Please hold.

[tim-schilling]

These commits should be squashed on merge and the commit message updated to match the super admin language rather than ops team.