Remove 404 file from sitemap.xml in 11ty
I realised that the sitemap.xml file was listing the 404 page - we really don't want that in there as the search engines don't want it. The 11ty sitemap.njk file had the answer in its frontmatter for any page you don't want in a collection, and that includes the All collection, I added this in the frontmatter of the 404 page:
eleventyExcludeFromCollections: true
And then any page I want to manually jeep out of the sitemap I can add sitemapIgnore: true to the frontmatter.
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