Thanks to Let's Encrypt. We can now get SSL certificates for free!
I was slacking off while doing homework. That's why I did the HTTPS setup yesterday. :P
Currently, only some of the subdomains of sadale.net supports HTTPS. I'd like to test it for a while before enabling it for all of the domains.
Many image links in blogposts are still having http:// prefix . I'll convert them to https:// when I got time.