fix: atom/rss feed issues

Merged faried nawaz requested to merge faried/pleroma:fix/tag-feed-crashes into develop


  • issue #3045 (closed) by not breaking HTML encoded entities in the feed item title
  • extracts the published data from @data in the feed eex templates, not
  • works around missing summary fields in activities (pleroma generates them, mastodon appears not to)

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