Remove stale OWNERS files in k/website (#16745)

assets/sass/OWNERS

@@ -1,10 +0,0 @@
-# See the OWNERS docs at https://go.k8s.io/owners
-
-# Allow CSS/SASS updates from blog and case studies owners 
-options:
-  no_parent_owners: false
-reviewers:
-  - alexcontini
-approvers:
-  - alexcontini
-  

static/images/blog/OWNERS

@@ -1,11 +0,0 @@
-# See the OWNERS docs at https://go.k8s.io/owners
-
-# Owned by Kubernetes Blog reviewers.
-options:
-  no_parent_owners: true
-# reviewers: // List any reviewers here
-approvers:
-  - kbarnard10
-  - natekartchner
-  - sarahkconway
-  - zacharysarah