Close comments after N days

[zackw]

Feature request: I'd like to be able to tell isso that it should not accept any more comments on a particular article after N days (from the publication of the article).

[NerosTie]

:+1:

[bactisme]

:+1:

[ghost]

:+1:

[ix5]

For later reference, this would require scraping the date from the fetched page, which might fail (needing retry logic). We already fetch the page title and have a dependency for html5lib.

[ix5]

Related: https://github.com/posativ/isso/issues/71