Update README.md to change build-status badge

Author: Robert Krátký

README.md

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 # The Modular Documentation Project Source Repository
 
-## Modular Documentation Reference Guide [![Build Status](https://travis-ci.org/redhat-documentation/modular-docs.svg?branch=master)](https://travis-ci.org/redhat-documentation/modular-docs)
+## Modular Documentation Reference Guide ![Build Status](https://github.com/redhat-documentation/modular-docs/actions/workflows/deploy-site.yml/badge.svg)
 
 The Modular Documentation Reference Guide contains the essential information to start writing documentation in a modular way.
 You can view the latest build of the guide here: