Update CI: modify workflow to build and test on main and develop branches

Author: Gary Woodfine

README.md

@@ -33,13 +33,7 @@ Running the following command will:
 
 ```bash
 ## with npm
-npm install @threenine/nuxt-fathom
-
-## with pnpm 
-pnpm add @threenine/nuxt-fathom
-
-## with yarn
-yarn add @threenine/nuxt-fathom
+npx nuxi module add @threenine/nuxt-fathom
 ```
 
 ## Basic Usage