Replace github.com/lukeapage/node-markdown-spellcheck

[erikgb]

The tool we use to perform spellcheck in this project hasn't been touched for 6 years, and for the last 6 months, it's generating security alarms. We should try to find something maintained with equivalent functionality.

[erikgb]

/help
/good-first-issue

[cert-manager-prow]

@erikgb:
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If this request no longer meets these requirements, the label can be removed
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/help
/good-first-issue

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