[ANNOUNCE] c-ares.org downloads and website updates

[Brad House]

Hello team!

I just wanted to announce that https://c-ares.org is now hosted by 
GitHub Pages (with a custom domain) rather than a dedicated server that 
Daniel has graciously maintained all these years.

Any distributions that are currently pulling packages from 
https://c-ares.org/download/c-ares-X.Y.Z.tar.gz (or even the legacy 
https://c-ares.haxx.se) are now broken.  Please update your packaging 
scripts to point to the github release assets, which is now the official 
repository for signed release packages.

On another note, there is now a new package signing key approved for 
upcoming releases, mine :)

Brad House <brad at brad-house.com> - DA7D64E4C82C6294CB73A20E22E3D13B5411B7CA
https://keyserver.ubuntu.com/pks/lookup?op=get&search=0xda7d64e4c82c6294cb73a20e22e3d13b5411b7ca 


We will likely be trying this out for the c-ares 1.30.0 release tomorrow 
am (EDT), and track what fallout arises.

Please note that Daniel's signing key is still valid and he may perform 
additional releases in the future as well.  This just adds redundancy to 
the release process so we're not blocked on any single individual.

For updated download links as well as information on valid signing keys, 
please see https://c-ares.org/download/

Thanks!

-Brad House