Squashed '.themes/whitespace/' changes from f41aafb..afd83da

afd83da Merge pull request #44 from yous/patch-external-url
5f1a1ac Fix hovered title link colors for external url

git-subtree-dir: .themes/whitespace
git-subtree-split: afd83da72b22bb4d830b1b05e97a56ef133cb1ff
Merge commit '5ee9006c45c60a401464f09e43eb40952b70e619' into source
Apply whitespace theme
Update CDs
Add new post "Introducing Source Han Sans: An open source Pan-CJK
typeface"