FIX: website/arte: Reimpl. support

This is a backport of the 0.9+ script [485ce77c4638].

  - ident: Revise, and add "http" to "categories"
  - Parse media properties from a new location
  - Parse "duration" media property

See the commit 485ce77c4638 for additional notes.

Signed-off-by: Toni Gundogdu <legatvs@gmail.com>
tests: expire.t: Re-enable, update arte URL and pattern

Signed-off-by: Toni Gundogdu <legatvs@gmail.com>
Merge branch 'tg/maint__fix_website/arte' into maint-0.4