use a more canonical URL for Debian, fix version

the PTS is a better place as it shows more information and is a static HTML file instead of a search query.

also, 3.0 is in debian experimental.
Merge pull request #2 from rgieseke/master

Remove link to GitHub issues
Merge pull request #3 from rgieseke/master

Update to use Hakyll 4
about this site: 3.0 docs are now built from master
about this site: update commit publishing time
Merge pull request #1 from anarcat/patch-1

use a more canonical URL for Debian, fix version
Update link of Windows binary