chore: minor optimizations

[hirasso]

Related: https://github.com/swup/fragment-plugin/pull/81

Description

• disable fuzzy linkification, to prevent things like rule.to to be converted to a link (see https://markdown-it.github.io/linkify-it/doc/ > fuzzyLink)
• remove debug logging
• update npm

Checks

• [x] The PR is submitted to the master branch
• [x] The code was linted before pushing (npm run lint)

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