Update links to reveal.js documentation (#6386)

With the [release of reveal.js 4.0.0](https://github.com/hakimel/reveal.js/releases/tag/4.0.0), the documentation moved from the GitHub README to the dedicated website <https://revealjs.com/>.

Note that there are [further adjustments](https://revealjs.com/upgrading/) to the [Pandoc template](https://github.com/jgm/pandoc-templates/blob/master/default.revealjs) necessary in order to make Pandoc work with reveal.js 4.0.0.
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@ -2162,7 +2162,7 @@ To turn off boolean flags that default to true in reveal.js, use `0`.
: additional attributes for the title slide of reveal.js slide shows.
See [background in reveal.js and beamer] for an example.
[reveal.js configuration options]: https://github.com/hakimel/reveal.js#configuration
[reveal.js configuration options]: https://revealjs.com/config/
### Variables for Beamer slides
@ -5460,9 +5460,8 @@ To add a background image to the automatically generated title slide, use the
`title-slide-attributes` variable in the YAML metadata block. It must contain
a map of attribute names and values.
See the [reveal.js
documentation](https://github.com/hakimel/reveal.js#slide-backgrounds)
for more details.
See the [reveal.js documentation](https://revealjs.com/backgrounds/) for more
details.
For example in reveal.js: