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ref #1420
Use libtidy https://github.com/htacg/tidy-html5 to check the build-ed
_site
generated on CI.Also update validate-website gem.
Time ~ 10sec for
check:markup
cf https://travis-ci.org/ruby/www.ruby-lang.org/builds/504098647#L590Why?
Since #832 we can see that errors happen on markup even it we are using markdown on most of the pages (cf #1418, #1458, #1987 )
The main blocker before was that it increase build time but the complete website check take now ~10sec to ~12sec
cc @stomar @hsbt