docs: update README.md

Author: jsubida

README.md

@@ -12,3 +12,7 @@ Our members focus on:
 We welcome participants at any stage of their RSE community-building journey, from those exploring initial steps to those leading established groups. Through regular meetings, members exchange practical insights on community outreach, event planning, and maintaining active engagement while addressing the unique organizational contexts and challenges each institution faces.
 
 If you have a question or want to learn about the experiences of others, please head over to our [Discussion Forum](https://github.com/USRSE/ag-institutional-rse-networking/discussions)!
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+## Website
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+Built using [Hugo](https://gohugo.io). Theme is [Hugo Book](https://github.com/alex-shpak/hugo-book)