bump Node.js to 16 & 18

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

docs/features/search/how-to-guides.md

@@ -171,6 +171,6 @@ const highlightOverride = {
 };
 ```
 
-[obj-mode]: https://nodejs.org/docs/latest-v14.x/api/stream.html#stream_object_mode
-[read-stream]: https://nodejs.org/docs/latest-v14.x/api/stream.html#stream_readable_streams
+[obj-mode]: https://nodejs.org/dist/latest-v16.x/docs/api/stream.html#stream_object_mode
+[read-stream]: https://nodejs.org/dist/latest-v16.x/docs/api/stream.html#readable-streams
 [async-gen]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/for-await...of#iterating_over_async_generators

docs/getting-started/running-backstage-locally.md

@@ -21,12 +21,12 @@ This is made easy with a version manager such as
 # Installing current LTS release
 nvm install --lts
 > Installing latest LTS version.
-> Downloading and installing node v14.15.1...
-> Now using node v14.15.1 (npm v6.14.8)
+> Downloading and installing node v16.16.0...
+> Now using node v16.16.0 (npm v8.11.0)
 
 # Checking your version
 node --version
-> v14.15.1
+> v16.16.0
 ```
 
 - Yarn

docs/tutorials/quickstart-app-plugin.md

@@ -20,7 +20,7 @@ title: Adding Custom Plugin to Existing Monorepo App
 > functionality, extend the Sidebar to make our life easy. Finally, we add
 > custom code to display GitHub repository information.
 >
-> This document assumes you have Node.js 14 active along with Yarn and Python.
+> This document assumes you have Node.js 16 active along with Yarn and Python.
 > Please note, that at the time of this writing, the current version is
 > 0.1.1-alpha.21. This guide can still be used with future versions, just,
 > verify as you go. If you run into issues, you can compare your setup with mine