[BUG] `ERR_CERT_COMMON_NAME_INVALID` error on robotcode.io site when accessing it with `https://www.robotcode.io`

[DetachHead]

Describe the bug when accessing the website via https and with the www subdomain, i get a ERR_CERT_COMMON_NAME_INVALID error. happens on firefox, chrome and safari

To Reproduce Steps to reproduce the behavior:

1. Go to https://www.robotcode.io (error)
2. Go to https://robotcode.io (no error)
3. Go to http://www.robotcode.io (no error)
4. Go to http://robotcode.io (no error)

Expected behavior no error when accessing https://www.robotcode.io

Screenshots/ Videos