Missing redirects

[ferki]

It seems the current setup has the following missing redirects:

• rexify.org => www.rexify.org (e.g. https://www.rexify.org/blog/2020/06/09/rex-on-stackshare.html works but https://rexify.org/blog/2020/06/09/rex-on-stackshare.html does not)
• https://www.rexify.org/blog => https://www.rexify.org/blog/ (the former just shows the bare github page; note the trailing slash)