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Outline Processor Markup Language (OPML) is a popular format for exchanging subscription lists between readers and aggregators.
Since a webring is a collection of sites that someone might want to subscribe to as a whole, it would make sense to offer a way to subscribe to all feeds. Ringfairy already exposes the RSS feed link for each site, when provided. This PR enables generating an OPML file of the whole ring to offer a convenient route to users instead of having to subscribe to each site's RSS feed individually.
The sites are only added to the OPML list if a RSS entry is found and it also respects the audit setting.