move wg-polonius to t-types

and move dylan to alumni

teams/wg-polonius.toml

@@ -1,6 +1,5 @@
 name = "wg-polonius"
-subteam-of = "compiler"
-kind = "working-group"
+subteam-of = "types"
 
 [people]
 leads = ["lqd", "nikomatsakis"]
@@ -10,7 +9,7 @@ members = ["lqd", "nikomatsakis", "amandasystems", "matthewjasper", "ecstatic-mo
 name = "Polonius working group"
 description = "Working on an experimental new borrow-checker implementation"
 repo = "https://rust-lang.github.io/compiler-team/working-groups/polonius/"
-zulip-stream = "t-compiler/wg-polonius"
+zulip-stream = "t-types/polonius"
 
 [[github]]
 orgs = ["rust-lang"]