Update build.yml to install Hugo using apt instead of Homebrew

Switched from using Homebrew to install Hugo to using apt in order to
simplify the build process and avoid unnecessary dependencies.

.github/workflows/build.yml

@@ -25,8 +25,7 @@ jobs:
       - name: Build website with hugo
         working-directory: src
         run: |
-          yes | /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
-          yes | brew install hugo
+          yes | apt install hugo
           hugo
       # Checkout destination repository
       - name: Checkout dest repo