Remove the now unused _data/core-team.yml and the relevant scss. (#24593)

_data/core-team.yml

-- name: Mark Otto
-  user: mdo
-  gravatar: bc4ab438f7a4ce1c406aadc688427f2c
-
-- name: Jacob Thornton
-  user: fat
-  gravatar: a98244cbdacaf1c0b55499466002f7a8
-
-- name: Chris Rebert
-  user: cvrebert
-  gravatar: edec428c425453955f770095a7d26c50
-
-- name: Julian Thilo
-  user: juthilo
-  gravatar: 0f7dd3ce58a416be5685ea6194f82b11
-
-- name: XhmikosR
-  user: xhmikosr
-  gravatar: e37759b1ea0125d4e97b1e00b5eed26f
-
-- name: Heinrich Fenkart
-  user: hnrch02
-  gravatar: 0d53f5d3d3d28bd470f394d98f7ef48f
-
-- name: Patrick H. Lauke
-  user: patrickhlauke
-  gravatar: 357f279672db832fc41a5a2f36559fcb
-
-- name: Thomas McDonald
-  user: thomas-mcdonald
-  gravatar: 24cd55ab1a62ffb113ab8c02f64c9301
-
-- name: Gleb Mazovetskiy
-  user: glebm
-  gravatar: 729f685b8e8d7e9feed18c177c82e59b
-
-- name: Johann-S
-  user: johann-s
-  gravatar: d90d49733a4fe1aa461e45cb4a4fd9e3
-
-
-- name: Andres Galante
-  user: andresgalante
-  gravatar: 03dc4f2e26e476958c952505c8d8f563

assets/scss/_team.scss

-.bd-team {
-  margin-bottom: 1.5rem;
-
-  .team-member {
-    line-height: 2rem;
-    color: #555;
-  }
-
-  .team-member:hover,
-  .team-member:focus {
-    color: #333;
-  }
-
-  .team-member:hover {
-    text-decoration: none;
-  }
-
-  .github-btn {
-    float: right;
-    width: 180px;
-    height: 1.25rem;
-    margin-top: .25rem;
-    border: 0;
-  }
-
-  img {
-    float: left;
-    width: 2rem;
-    margin-right: .5rem;
-    border-radius: .25rem;
-  }
-}

assets/scss/docs.scss

@@ -44,7 +44,6 @@
 @import "buttons";
 @import "callouts";
 @import "examples";
-@import "team";
 @import "browser-bugs";
 @import "brand";
 @import "colors";