add index page

Signed-off-by: seven <[email protected]>

docs/index.md

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+a CI/CD service considerations:
+
+- Zero downtime
+
+- health check
+
+    - **Startup probes**
+
+    - **Readiness probes**
+
+    - **Liveness probes**
+
+      > https://www.fairwinds.com/blog/a-guide-to-understanding-kubernetes-liveness-probes-best-practices
+
+- Blue/green deployment
+
+- canary deployment
+
+- service access control(private/public/geo-blocker)
+
+- Authentication/autorization
+
+- Fast fail and rollback
+
+- full stack local setup