chore: remove unused dep from removed slides

Followup to #11854

package.json

@@ -163,7 +163,6 @@
         "react-transition-group": "4.3.0",
         "react-virtuoso": "4.12.5",
         "remove-accents": "0.4.2",
-        "reveal.js": "^4.5.0",
         "sanitize-filename": "1.6.3",
         "send-intent": "^5.0.0",
         "shepherd.js": "^9.1.0",

yarn.lock

@@ -7641,11 +7641,6 @@ reusify@^1.0.4:
   resolved "https://registry.yarnpkg.com/reusify/-/reusify-1.1.0.tgz#0fe13b9522e1473f51b558ee796e08f11f9b489f"
   integrity sha512-g6QUff04oZpHs0eG5p83rFLhHeV00ug/Yf9nZM6fLeUrPguBTkTQOdpAWWspMh55TZfVQDPaN3NQJfbVRAxdIw==
 
-reveal.js@^4.5.0:
-  version "4.6.1"
-  resolved "https://registry.yarnpkg.com/reveal.js/-/reveal.js-4.6.1.tgz#5eda9769e30df922a7cd0f2a2f52bb197c07a124"
-  integrity sha512-1CW0auaXNPmwmvQ7TwpszwVxMi2Xr5cTS3J3EBC/HHgbPF32Dn7aiu/LKWDOGjMbaDwKQiGmfqcoGQ74HUHCMw==
-
 rfdc@^1.3.0:
   version "1.4.1"
   resolved "https://registry.yarnpkg.com/rfdc/-/rfdc-1.4.1.tgz#778f76c4fb731d93414e8f925fbecf64cce7f6ca"