Update 8.x redirects to newly added v3 install tutorials (#3315)

Author: kilfoyle

resources/asciidoctor/lib/chunker/v3-mapping.json

@@ -3726,9 +3726,9 @@
     "/en/elastic-stack/*/elastic-stack-highlights.html": "/docs/release-notes",
     "/en/elastic-stack/*/elasticsearch-breaking-changes.html": "/docs/release-notes/elasticsearch/breaking-changes",
     "/en/elastic-stack/*/index.html": "/docs/deploy-manage",
-    "/en/elastic-stack/*/install-stack-demo-secure.html": "/docs/deploy-manage/security/self-setup",
+    "/en/elastic-stack/*/install-stack-demo-secure.html": "docs/deploy-manage/deploy/self-managed/tutorial-self-managed-secure",
     "/en/elastic-stack/*/installing-elastic-stack.html": "/docs/deploy-manage/deploy/self-managed/installing-elasticsearch",
-    "/en/elastic-stack/*/installing-stack-demo-self.html": "/docs/deploy-manage/deploy/self-managed",
+    "/en/elastic-stack/*/installing-stack-demo-self.html": "/docs/deploy-manage/deploy/self-managed/tutorial-self-managed-install",
     "/en/elastic-stack/*/kibana-breaking-changes.html": "/docs/release-notes/kibana",
     "/en/elastic-stack/*/overview.html": "/docs/get-started/the-stack",
     "/en/elastic-stack/*/security-breaking-changes.html": "/docs/release-notes/security",