Update docs

Author: camdecoster

CONTRIBUTING.md

@@ -78,7 +78,7 @@ We use the following [labels](https://github.com/plotly/plotly.js/labels) to tra
 #### Prerequisites
 
 - git
-- [node.js](https://nodejs.org/en/). We recommend using node.js v18.x.
+- [node.js](https://nodejs.org/en/). We recommend using node.js v22.x.
   Upgrading and managing node versions can be easily done using
   [`nvm`](https://github.com/nvm-sh/nvm) or its Windows alternatives.
 - [`npm`](https://www.npmjs.com/) v10.x and up to ensure that the

CUSTOM_BUNDLE.md

@@ -5,8 +5,9 @@ Make sure you have the versions of node/npm that's recommended:
 - plotly.js before 2.5: Node 12/npm 6
 - plotly.js from 2.5: Node 16/npm 8
 - plotly.js from 2.35: Node 18/npm 10
+- plotly.js from 4.0: Node 22/npm 10
 
-To download a specific node version look [here](https://nodejs.org/en/download/package-manager).
+To download a specific node version look [here](https://nodejs.org/en/download).
 
 Note: For CI, it's faster to do `git clone --depth 1` to only get one commit.