feat: enforce user roles

enforces user admin role requirement for
- creating / deleting / setting role for organization users
- creating / deleting / setting role for project users
- updating project name
- deleting project

hides action elements based on role for
- admin console
- team settings if team is only visible through project membership
- add project tile if not team admin
- project name text editor if not team / project admin
- add redirect from team page if settings only visible through project
  membership
- add redirect from admin console if not org admin

role enforcement is handled on the api side through a custom GraphQL
directive `hasRole`. on the client side, role information is fetched in
the TopNavbar's `me` query and stored in the `UserContext`.

there is a custom hook, `useCurrentUser`, that provides a user object
with two functions, `isVisibile` & `isAdmin` which is used to check
roles in order to render/hide relevant UI elements.

internal/graph/schema/team_member.gql

@@ -1,8 +1,11 @@
 extend type Mutation {
-  setTeamOwner(input: SetTeamOwner!): SetTeamOwnerPayload!
-  createTeamMember(input: CreateTeamMember!): CreateTeamMemberPayload!
-  updateTeamMemberRole(input: UpdateTeamMemberRole!): UpdateTeamMemberRolePayload!
-  deleteTeamMember(input: DeleteTeamMember!): DeleteTeamMemberPayload!
+  createTeamMember(input: CreateTeamMember!):
+    CreateTeamMemberPayload! @hasRole(roles: [ADMIN], level: TEAM, type: TEAM)
+  updateTeamMemberRole(input: UpdateTeamMemberRole!):
+    UpdateTeamMemberRolePayload! @hasRole(roles: [ADMIN], level: TEAM, type: TEAM)
+  deleteTeamMember(input: DeleteTeamMember!):
+    DeleteTeamMemberPayload! @hasRole(roles: [ADMIN], level: TEAM, type: TEAM)
+
 }
 
 input DeleteTeamMember {
@@ -35,16 +38,6 @@ input UpdateTeamMemberRole {
 
 type UpdateTeamMemberRolePayload {
   ok: Boolean!
+  teamID: UUID!
   member: Member!
 }
-
-input SetTeamOwner {
-  teamID: UUID!
-  userID: UUID!
-}
-
-type SetTeamOwnerPayload {
-  ok: Boolean!
-  prevOwner: Member!
-  newOwner: Member!
-}