Changes required after merging Acrylamid to 13f0a1d4.
Add archive views for years, months and days.

Although there are no actual links pointing to those pages, they are
useful when someone starts playing with the URLs.
Use Acrylamid 0.6.0 instead of a clone of the code.
Do not indent the Atom items.

See https://github.com/posativ/acrylamid/commit/82b52de9.
Add a <meta /> tag to show I use Acrylmid to generate the pages.
Close the <meta name="viewport"> tag.