Merge branch 'docs-links-fix' into 'master'

fixing diagram page links in sidebar

See merge request !5381

docs/understanding-bigbang/architecture-diagrams/.pages

 nav:
   - Kube API Server Webhooks: kube-apiserver-webhooks-diagram.md
   - Logs Data Flow: logs-data-flow-diagram.md
-  - Metrics Data Flow: metrics-data-flow.md
-  - Network Encryption and Ingress: network-encryption-and-ingress.md
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+  - Metrics Data Flow: metrics-data-flow-diagram.md
+  - Network Encryption and Ingress: network-encryption-and-ingress-diagram.md
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