niv reveal.js: update 15815efe -> e09437f4

## Changelog for reveal.js:
Commits: [hakimel/reveal.js@15815efe...e09437f4](hakimel/reveal.js@15815ef...e09437f)

* [`942304d8`](hakimel/reveal.js@942304d) add --slide-width/height css variables
* [`cd5c9c5b`](hakimel/reveal.js@cd5c9c5) build js
* [`61624aea`](hakimel/reveal.js@61624ae) 🤦
* [`7ebade72`](hakimel/reveal.js@7ebade7) remove 20px vertical padding on slide sections
* [`c9107476`](hakimel/reveal.js@c910747) don't write '#/' to url on first slide, remove history api feature detection
* [`d272628f`](hakimel/reveal.js@d272628) add support for data-visibility=hidden
* [`ac79c7cd`](hakimel/reveal.js@ac79c7c) leave the progress bar empty if there's < 2 slides
* [`166af893`](hakimel/reveal.js@166af89) all themes now have contrasting text colors based on slide bg
* [`37d83374`](hakimel/reveal.js@37d8337) add support for wrapping code in script tempalte to avoid html parser hakimel/reveal.js#2684
* [`66cbd66f`](hakimel/reveal.js@66cbd66) fix slide numbering issue with uncounted horizontal slides (fixes hakimel/reveal.js#2675)
* [`1b6a3b1e`](hakimel/reveal.js@1b6a3b1) add support for auto-sized big text via r-fit-text
* [`aa667791`](hakimel/reveal.js@aa66779) fit-text helper now triggers lazyily when slide enters view distance
* [`be460814`](hakimel/reveal.js@be46081) correct scope for fit-text selector
* [`cd2a7924`](hakimel/reveal.js@cd2a792) allow images inside of h/vstacks to be proportionally downsized
* [`2fccb774`](hakimel/reveal.js@2fccb77) add 'playsinline' to all inline videos, dont mute background videos on mobile
* [`9ff27cfb`](hakimel/reveal.js@9ff27cf) bg videos remain muted on mobile, otherwise broken when navigating with swipe gestures
* [`2bfe705e`](hakimel/reveal.js@2bfe705) include /css and /js in npm package hakimel/reveal.js#2712
* [`b05e530f`](hakimel/reveal.js@b05e530) Fix URL to pdf-export documentation
* [`3a99a7b7`](hakimel/reveal.js@3a99a7b) shuffle now applies to vertical slides as well
* [`a150d0c5`](hakimel/reveal.js@a150d0c) Start relative paths in CSS with ./
* [`80d96b4f`](hakimel/reveal.js@80d96b4) upgrade rollup-plugin-terser to fix npm warning hakimel/reveal.js#2751
* [`faa8b56e`](hakimel/reveal.js@faa8b56) dependency upgrades
* [`aa62bd42`](hakimel/reveal.js@aa62bd4) Update README.md
* [`2c121d22`](hakimel/reveal.js@2c121d2) docs: Fix simple typo, transiition -> transition
* [`676936e3`](hakimel/reveal.js@676936e) revert debug change to index.html
* [`e09437f4`](hakimel/reveal.js@e09437f) escape HTML entities in code parsed from markdown, fixes hakimel/reveal.js#2744

nix/sources.json

@@ -173,10 +173,10 @@
         "homepage": "https://revealjs.com",
         "owner": "hakimel",
         "repo": "reveal.js",
-        "rev": "15815efe05ca69c35ce66cfdbf93316e1db66ecb",
-        "sha256": "1g3h710rhpyq4vnh6rgyay2dyjpw4rw99p062yhwhgrjkgjyzrc2",
+        "rev": "e09437f4fac47305679374d2b2516a76f6ceb899",
+        "sha256": "0mppzm0cp5v4r7aqim2jbxji836di86an0p9j5wjmnlg5ali3y49",
         "type": "tarball",
-        "url": "https://github.com/hakimel/reveal.js/archive/15815efe05ca69c35ce66cfdbf93316e1db66ecb.tar.gz",
+        "url": "https://github.com/hakimel/reveal.js/archive/e09437f4fac47305679374d2b2516a76f6ceb899.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
     "rotate-text.el": {