Added a html based preview of the xkcd-script font.

[pelson]

Adds a little preview page so that you can type what you like with the xkcd-script font.

Confession: html isn't my strength 😉

Demo: https://rawgit.com/pelson/xkcd-font/web-preview/preview.html

[pelson]

I cancelled the CI so that we don't get a new commit with a rebuilt font. #25 should fix.

[rgbkrk]

Merged #25, rebase needed now even though it's the generated font files.

[pelson]

Rebased.