Set labels and reviewers for website assets

assets/OWNERS

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+# Label certain changes as web development
+
+filters:
+  "\\.js":
+    labels:
+    - area/web-development
+  "\\.scss$":
+    labels:
+    - area/web-development

assets/images/OWNERS

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+# See the OWNERS docs at https://go.k8s.io/owners
+
+# This is the directory for common images. Allow English localization
+# reviewers to review and approve.
+# Teams and members are visible at https://github.com/orgs/kubernetes/teams.
+
+reviewers:
+- sig-docs-en-reviews
+
+approvers:
+- sig-docs-en-owners
+
+filters:
+  "\\.svg":
+    labels:
+    - area/web-development
+  "\\.png$":
+    labels:
+    - area/web-development
+  "\\.jpe?g$":
+    labels:
+    - area/web-development

static/css/OWNERS

@@ -0,0 +1,6 @@
+# Label certain changes as web development
+
+filters:
+  "\\.css$":
+    labels:
+    - area/web-development

static/js/OWNERS

@@ -0,0 +1,9 @@
+# Label certain changes as web development
+
+approvers:
+- sig-docs-website-owners # Defined in OWNERS_ALIASES
+
+filters:
+  "\\.js":
+    labels:
+    - area/web-development