Use full post in RSS feed rather than only its summary

Arnaud Ferrarisrequested to merge
rss into master

We were only showing the summary in our RSS feed, severly limiting its usefullness :-). This makes the full post be part of the RSS feed.

This is based on the upstream RSS feed and uses the .Content instead of the .Summary to show the full RSS post in the feed, instead of the abbreviated summary. Kudos to https://www.godo.dev/tutorials/hugo-full-text-rss/ for the inspiration.

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