[Update] CONTRIBUTING.md

[wildmanonline]

This PR updates our contributing instructions:

• Updates Hugo installation instructions to use v0.116.1 (instead of v0.111.3). This version is now required to use Tailwind v3 (merged in a few weeks ago).
• Adds a section that explains how to successfully upgrade your local environment to preview the docs site (now that it uses Tailwind v3).

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