www: add topics_(new|active).(html|atom) endpoints

This seems like a easy (but WWW-specific) way to get recently
created and recently active topics as suggested by Konstantin.

To do this with Xapian will require a new columns and
reindexing; and I'm not sure if the current lei handling of
search results by dumping results to a format readable by common
MUAs would work well with this.  A new TUI may be required...

Suggested-by: Konstantin Ryabitsev <konstantin@linuxfoundation.org>
Link: https://public-inbox.org/meta/20231107-skilled-cobra-of-swiftness-a6ff26@meerkat/

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