Use yarn in GHA

Author: jakeboone02

.github/workflows/gh-pages.yml

@@ -18,7 +18,7 @@ jobs:
       - name: Test Build
         run: |
           yarn install --immutable
-          npm run build
+          yarn build
   gh-release:
     if: github.event_name != 'pull_request'
     runs-on: ubuntu-latest
@@ -38,4 +38,4 @@ jobs:
           git config --global user.email "jakeboone02@gmail.com"
           git config --global user.name "Jake Boone"
           yarn install --immutable
-          npm run deploy
+          yarn deploy