Add CNAME-file to get www.akafred.com to work.

This is done after the proper changes has been done in DNS:

$ dig www.akafred.com +nostats +nocomments +nocmd

; <<>> DiG 9.8.3-P1 <<>> www.akafred.com +nostats +nocomments +nocmd
;; global options: +cmd
;www.akafred.com.		IN	A
www.akafred.com.	3600	IN	CNAME	akafred.github.io.
akafred.github.io.	3600	IN	CNAME	github.map.fastly.net.
github.map.fastly.net.	15	IN	A	185.31.17.133