Reclaim broken high-authority backlinks with 301 redirects

Add 23 301 redirects for docs.tigera.io/calico paths that DR 50+ external
sites link to but which now 404 after the Docusaurus reorg. Each broken URL
is mapped 1:1 to the most relevant live page (never the homepage), ordered
by referring-domain rating. Fixes the projectcalico.org -> docs.tigera.io
redirect chains that currently dead-end.

SEO audit request from Laura Ferguson (2026-07).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: ctauchen

static/_redirects

@@ -91,6 +91,36 @@
 /calico/latest/getting-started/kubernetes/windows-calico/manual-install/quickstart /calico/latest/getting-started/kubernetes/windows-calico 301
 /calico/latest/about/product-comparison /calico/latest/about/calico-product-editions 301
 
+# SEO: reclaim broken high-authority backlinks (Laura F. 2026-07), ordered by DR
+# DR 96
+/calico/latest/getting-started/kubernetes/flannel/flannel /calico/latest/getting-started/kubernetes/flannel/install-for-flannel 301
+/calico/latest/networking/ip-autodetection /calico/latest/networking/ipam/ip-autodetection 301
+/calico/latest/maintenance/kubernetes-upgrade /calico/latest/operations/upgrading/kubernetes-upgrade 301
+# DR 94
+/calico/latest/security/adopt-zero-trust /calico/latest/network-policy/adopt-zero-trust 301
+/calico/latest/introduction/ /calico/latest/about 301
+/calico/latest/maintenance/ebpf/enabling-bpf /calico/latest/operations/ebpf/enabling-ebpf 301
+/calico/latest/networking/dual-stack /calico/latest/networking/ 301
+/calico/latest/latest/getting-started/kubernetes/ /calico/latest/getting-started/kubernetes/quickstart 301
+/calico/latest/latest/getting-started/kubernetes/installation/flannel /calico/latest/getting-started/kubernetes/flannel/install-for-flannel 301
+/calico/latest/maintenance/troubleshoot/troubleshooting /calico/latest/operations/troubleshoot/troubleshooting 301
+/calico/latest/master/reference/architecture/ /calico/latest/reference/architecture/ 301
+/calico/latest/latest/getting-started/kubernetes/installation/calico /calico/latest/getting-started/kubernetes/self-managed-onprem/onpremises 301
+# DR 92
+/calico/latest/security/kubernetes-default-deny /calico/latest/network-policy/get-started/kubernetes-default-deny 301
+/calico/latest/maintenance/troubleshooting /calico/latest/operations/troubleshoot/troubleshooting 301
+/calico/latest/latest/introduction/ /calico/latest/about 301
+/calico/latest/security/comms/secure-bgp /calico/latest/network-policy/comms/secure-bgp 301
+/calico/latest/getting-started/calicoctl/install /calico/latest/operations/calicoctl/install 301
+/calico/latest/network-policy/non-privileged /calico/latest/network-policy/ 301
+/calico-cloud/threat/security-posture-overview /calico-cloud/threat/ 301
+# DR 91
+/calico/latest/getting-started/windows-calico/quickstart /calico/latest/getting-started/kubernetes/windows-calico/ 301
+/calico/latest/networking/change-block-size /calico/latest/networking/ipam/change-block-size 301
+# DR 90
+/calico/latest/en/latest/index.html /calico/latest/about 301
+/calico/latest/en/latest/involved.html /calico/latest/reference/involved 301
+
 # Removing placeholder index pages
 
 /calico/latest/getting-started/kubernetes/ /calico/latest/about 301