nogogiri security vulnerability

[crkoehnen]

"We found a potential security vulnerability in one of your dependencies.
The nokogiri dependency defined in Gemfile.lock has a known critical severity security vulnerability in version range < 1.8.1 and should be updated.

Review vulnerable dependency
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• Do we really need nokogiri?
• Do we upgrade nokogiri?
• Can we move to a static site generator? (If so, which?)