chore(deps): update docusaurus to v1.14.0

[renovate[bot]]

This PR contains the following updates:

Package	Update	Type	Change	Sourcegraph
docusaurus	minor	devDependencies	1.13.0 -> 1.14.0

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Release Notes

facebook/docusaurus

### [`v1.14.0`](https://togithub.com/facebook/docusaurus/blob/master/CHANGELOG.md#​1140---2019-10-20) [Compare Source](https://togithub.com/facebook/docusaurus/compare/v1.13.0...v1.14.0) **Added** - feat: allow specifying meta desc in front matter ([#​1859](https://togithub.com/facebook/docusaurus/pull/1859)) **Docs** - docs: document docker is optional ([#​1848])([#​1848](https://togithub.com/facebook/docusaurus/pull/1848))

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