recipes: lwn_weekly: outline quize box & authors

Fill authors names in articles headers with bg color
to separate them from article body. The same for
quiz boxes, plus outline them with border line,
as they're put directly within article's text.

Signed-off-by: Sergiy Kibrik <sakib@meta.ua>
recipes: lwn_weekly: improve table handling

Site uses table layout a lot, both for page formatting
and within article's text, yet we clean up all tags
before & after article text, and remove what's left
from tables in-between, also removing useful tables
often embedded within articles. The better way seems
to keep only parts we actually interested about:
PageHeadline (article's title) and ArticleText and
not linearize table within ArticleText tag, thus
preserving useful tables.

Signed-off-by: Sergiy Kibrik <sakib@meta.ua>