Bump npm from 6.13.4 to 6.14.6 in /website/themes/reveal-hugo (#83)

Bumps [npm](https://github.com/npm/cli) from 6.13.4 to 6.14.6.
- [Release notes](https://github.com/npm/cli/releases)
- [Changelog](https://github.com/npm/cli/blob/latest/CHANGELOG.md)
- [Commits](https://github.com/npm/cli/compare/v6.13.4...v6.14.6)

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

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