Update dependency reveal-md to v6

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
reveal-md	^5.0.0 -> ^6.0.0

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Release Notes

webpro/reveal-md (reveal-md)

### [`v6.1.0`](https://togithub.com/webpro/reveal-md/releases/tag/6.1.0) [Compare Source](https://togithub.com/webpro/reveal-md/compare/6.0.1...6.1.0) - Update dependencies ([`5690938`](https://togithub.com/webpro/reveal-md/commit/5690938)) ### [`v6.0.1`](https://togithub.com/webpro/reveal-md/releases/tag/6.0.1) [Compare Source](https://togithub.com/webpro/reveal-md/compare/6.0.0...6.0.1) - Update dependencies ([`1ca74b9`](https://togithub.com/webpro/reveal-md/commit/1ca74b9)) - Now also copy images without alt ([#​474](https://togithub.com/webpro/reveal-md/issues/474)) ([`ac3d73c`](https://togithub.com/webpro/reveal-md/commit/ac3d73c)) ### [`v6.0.0`](https://togithub.com/webpro/reveal-md/releases/tag/6.0.0) [Compare Source](https://togithub.com/webpro/reveal-md/compare/5.5.2...6.0.0) - Update dependencies ([`2164467`](https://togithub.com/webpro/reveal-md/commit/2164467)) - Fix lint issues ([`be81101`](https://togithub.com/webpro/reveal-md/commit/be81101)) - Remove markdown plugin ([#​471](https://togithub.com/webpro/reveal-md/issues/471)) ([`b871d8c`](https://togithub.com/webpro/reveal-md/commit/b871d8c))

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