Remove invalid entries from generated sitemap.xml

[paulroemer]

Sitemap generation does not ignore pages that use the url frontmatter attribute and apparently also pages that don’t have any frontmatter attributes. That’s an oversight in DSP itself.

The quickfix is to remove the actual Vaadin 7/8 articles as they are anyway only used for BoV generation.

Affected docs versions: Vaadin 7/8

To reproduce:

for url in $(curl https://vaadin.com/docs/v8/sitemap/sitemap-0.xml | xmllint --xpath '//*[local-name() = "loc"]/text()' - ); do CURL_RESULT=$(curl -s -o /dev/null -X GET -I -w "%{http_code}" $url); if [ $CURL_RESULT = 404 ]; then   echo "$url"; fi; done