feat: upgrade multiple dependencies with Snyk

Snyk has created this PR to upgrade:
  - @metalsmith/drafts from 1.2.0 to 1.3.0.
    See this package in npm: https://www.npmjs.com/package/@metalsmith/drafts
  - @metalsmith/layouts from 2.6.0 to 2.7.0.
    See this package in npm: https://www.npmjs.com/package/@metalsmith/layouts
  - @metalsmith/markdown from 1.6.0 to 1.10.0.
    See this package in npm: https://www.npmjs.com/package/@metalsmith/markdown
  - @metalsmith/metadata from 0.1.0 to 0.3.0.
    See this package in npm: https://www.npmjs.com/package/@metalsmith/metadata
  - @metalsmith/permalinks from 2.4.0 to 3.0.1.
    See this package in npm: https://www.npmjs.com/package/@metalsmith/permalinks
  - jstransformer-nunjucks from 1.1.0 to 1.2.0.
    See this package in npm: https://www.npmjs.com/package/jstransformer-nunjucks
  - metalsmith from 2.5.1 to 2.6.3.
    See this package in npm: https://www.npmjs.com/package/metalsmith
  - metalsmith-if from 0.1.1 to 1.0.0.
    See this package in npm: https://www.npmjs.com/package/metalsmith-if
  - metalsmith-prism from 4.1.0 to 4.2.2.
    See this package in npm: https://www.npmjs.com/package/metalsmith-prism
  - metalsmith-static-files from 0.2.0 to 0.4.0.
    See this package in npm: https://www.npmjs.com/package/metalsmith-static-files

See this project in Snyk:
https://app.snyk.io/org/q1blue-rxw/project/9bc898c6-721d-42f7-93c9-845600113722?utm_source=github&utm_medium=referral&page=upgrade-pr