[docs] Revise Hugo installation instructions in CONTRIBUTING.md (#15706)

Updated installation instructions for Hugo to use version placeholders and reference the Netlify version.

Author: nimbinatus

CONTRIBUTING.md

@@ -24,9 +24,9 @@ If you'd like to edit a specific devopsdays event site (and/or contribute code),
 
   1. Install [Hugo](http://gohugo.io). Use the Hugo version that we use in [.github/workflows/hugo.yml](https://github.com/devopsdays/devopsdays-web/blob/main/.github/workflows/hugo.yml) file. [(Quick Install)](https://gohugo.io/getting-started/installing#binary-cross-platform)
 Examples of hugo installation with a version:
-   - maxOS: `brew install hugo@0.67.1`
-   - linux: `brew install hugo@0.67.1`
-   - windows: `choco install hugo -confirm --version 0.67.1 --allow-downgrade`
+   - maxOS: `brew install hugo@<version>` (pull from [the netlify version](https://github.com/devopsdays/devopsdays-web/blob/main/netlify.toml#L21))
+   - linux: `brew install hugo@<version>` (pull from [the netlify version](https://github.com/devopsdays/devopsdays-web/blob/main/netlify.toml#L21))
+   - windows: `choco install hugo -confirm --version <version> --allow-downgrade` (pull from [the netlify version](https://github.com/devopsdays/devopsdays-web/blob/main/netlify.toml#L21))
 
 
 ### View site locally