There were a few small hobbyist/user sites (sharing pastes), also
http://cubieboard.org that I tested and would not work with httpS, so
I left those alone. Also any apt repositories or archives.
I did not necessarily test every single link (would have taken all
day), however if it appeared to be to a "reasonably large"
website (i.e., WikiPedia, Armbian, Odroid, linux-sunxi, etc.) then I
assumed they should be able to manage httpS.
Also a few other minor formatting changes, and moved a couple things, while I was at it. Importantly however, I did not change the name of any headings, so as not to break any existing links.
