website move to HTTPS

[Eric Wong <e@80x24.org>]

Let's Encrypt seems to be working well for several months, now;
and I don't think it's a good idea to let spies know details of
your stack, so HTTPS access is available.

website: https://bogomips.org/rainbows/
list archives: https://bogomips.org/rainbows-public/

Note: I'm also dropping the rainbows.bogomips.org subdomain to
reduce subjectAltName bloat (and associated negotiation times).
Unencrypted HTTP will remain available indefinitely for folks
on old, un-upgradeable systems.

https://bogomips.org/rainbows.git/patch?id=50e91f1ac0cd
Author: Eric Wong <e@80x24.org>
Date:   Mon Oct 31 20:27:00 2016 +0000

    doc: Static_Files: remove Future section

    sendfile(2) is fewer syscalls and FDs than splice(2),
    and an open-file-cache is unlikely to be worth the complexity.

https://bogomips.org/rainbows.git/patch?id=4932b06f1391
Author: Eric Wong <e@80x24.org>
Date:   Mon Oct 31 20:13:40 2016 +0000

    doc: move homepage and update URLs to HTTPS

    Let's Encrypt is working well for us and having fewer domains
    reduces subjectAltName bloat to speed up connection
    establishment

    HTTP will remain working indefinitely since some old systems
    do not have modern TLS stacks.