Invalid TLS certificate served for v1-{5,6,7,8}.docs.kubernetes.io etc

**This is a...**

- [ ] Feature Request
- [x] Bug Report

**Problem:**
https://v1-8.docs.kubernetes.io/docs/reference/ serves an invalid TLS certificate:
```
This server could not prove that it is v1-8.docs.kubernetes.io; its security certificate is from *.netlify.com. This may be caused by a misconfiguration or an attacker intercepting your connection.
```

**Proposed Solution:**
Use a valid TLS certificate for https://v1-8.docs.kubernetes.io/.

**Page to Update:**
- https://v1-8.docs.kubernetes.io
- https://v1-7.docs.kubernetes.io
- https://v1-6.docs.kubernetes.io
- https://v1-5.docs.kubernetes.io

They are all linked from https://v1-9.docs.kubernetes.io/docs/reference/

(https://v1-9.docs.kubernetes.io is OK).

**Update (@zacharysarah, 30 July 2019):** Given subsequent releases since this issue was opened, versions 1.9 and 1.10 have also aged out and return invalid TLS certificate warnings.

**Update (@sftim, 4 September 2024):** Given subsequent releases since this issue was opened, versions 1.11 through to 1.26 have also aged out and return invalid TLS certificate warnings.