chore: add additional 404 redirects for missing documentation pages

Author: desimone

static/_redirects

@@ -243,3 +243,60 @@ https://docs.pomerium.io/* https://docs.pomerium.com/:splat 301!
 /docs/capabilities/mtls-services /docs/internals/certificates-and-tls#upstream-tls
 /docs/capabilities/hosted-authenticate-service /docs/capabilities/authentication#hosted-authenticate-service
 /docs/capabilities/self-hosted-authenticate-service /docs/capabilities/authentication#self-hosted-authenticate-service
+
+##################################################
+# NEW ADDITIONAL 404S => Real doc pages (from logs)
+##################################################
+
+/docs/core/upgrading /docs/deploy/upgrading
+/docs/topics/mutual-auth.html /docs/internals/mutual-auth
+/docs/identity-providers/gitlab /docs/integrations/user-identity/gitlab
+/docs/identity-providers/gitlab.html /docs/integrations/user-identity/gitlab
+/docs/deploy/enterprise/reference/configure.html /docs/deploy/enterprise/configure
+/docs/concepts/zero-trust /docs/internals/zero-trust
+/docs/enterprise/external-data/geoip /docs/integrations/request-context/geoip
+/docs/zero/import /docs/deploy/cloud/import
+/docs/identity-providers/azure /docs/integrations/user-identity/azure
+/docs/concepts/policies /docs/internals/glossary#policy
+/docs/zero/billing /docs/deploy/cloud/billing
+/docs/enterprise/external-data/ip-ranges /docs/integrations/request-context/ip-ranges
+/docs/k8s/ingress.html /docs/deploy/k8s/ingress
+/docs/capabilities/tcp/examples/mysql /docs/capabilities/non-http/examples/mysql
+/recipes/ad-guard /docs/guides/ad-guard
+/docs/community/security /docs/internals/security
+/docs/k8s/helm.html /docs/deploy/k8s/install
+/docs/reference/branding/logo-url /docs/reference/branding#logo-url
+/docs/guides/nginx https://0-20-0.docs.pomerium.com/docs/guides/nginx 301!
+/docs/guides/nginx.html https://0-20-0.docs.pomerium.com/docs/guides/nginx 301!
+/docs/capabilities/tcp/examples/ssh /docs/capabilities/non-http/examples/ssh
+/docs/topics/device-identity.html /docs/integrations/device-context/device-identity
+/docs/courses/fundamentals/jwt-verification /docs/get-started/fundamentals/core/jwt-verification
+/docs/capabilities/tcp/examples/git /docs/capabilities/non-http/examples/git
+/docs/reference/authenticate-internal-service-url /docs/reference/service-urls
+/docs/identity-providers/auth0 /docs/integrations/user-identity/auth0
+/docs/k8s/quickstart /docs/deploy/k8s/quickstart
+/docs/reference/cookie-secure /docs/reference/cookies#cookie-secure
+/docs/identity-providers /docs/integrations/user-identity/identity-providers
+/docs/reference/reference.html /docs/reference
+/docs/deploying/k8s/quickstart /docs/deploy/k8s/quickstart
+/docs/enterprise/configure /docs/deploy/enterprise/configure
+/docs/deploy/enterprise/upgrading.html /docs/deploy/upgrading
+/docs/reference/metrics-basic-authentication /docs/deploy/enterprise/configure-metrics
+/docs/reference/autocert/autocert-must-staple /docs/reference/autocert#autocert-must-staple
+/docs/guides/kubernetes.html /docs/deploy/k8s/quickstart
+/docs/troubleshooting /docs/internals/troubleshooting
+/docs/releases/pomerium-cli /docs/deploy/clients
+/docs/identity-providers/google /docs/integrations/user-identity/google
+/docs/topics/ppl /docs/internals/ppl
+/docs/guides/jwt-verification-with-envoy /docs/capabilities/getting-users-identity
+/docs/clients/pomerium-desktop /docs/deploy/clients
+/docs/deploy/enterprise/about/ /docs/deploy/enterprise
+/docs/topics/production-deployment.html /docs/deploy/upgrading
+/docs/identity-providers/apple /docs/integrations/user-identity/apple
+/docs/topics/programmatic-access.html /docs/internals/programmatic-access
+/docs/reference/forward-auth https://0-20-0.docs.pomerium.com/docs/reference/forward-auth 301!
+/docs/courses/fundamentals/self-hosted-pomerium /docs/get-started/fundamentals/core/self-hosted-pomerium
+/docs/guides/upstream-mtls.html /docs/capabilities/mtls-services
+/docs/topics/original-request-context /docs/capabilities/original-request-context
+/docs/capabilities/tcp/client /docs/capabilities/non-http/client
+/docs/core/from-source /docs/deploy/core