FIX: website/publicsenat: Reimpl. support

This is a rough backport of the eb4bb860cc481 written for the
0.9 series.

Notable changes:
  - Fetch and parse the media properties from an "emission URL" HTML
  - Remove support for the "idE" URLs (no apparent reason to keep)
  - `ident': Update URL path pattern

Signed-off-by: Toni Gundogdu <legatvs@gmail.com>
tests: default: publicsenat: Update, and remove "idE" testcase

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