formatted workflows

.github/workflows/marp-pages.yml

@@ -3,7 +3,7 @@ name: Deploy marp site to Pages
 on:
   # Runs on pushes targeting the default branch
   push:
-    branches: ["main"]
+    branches: ['main']
 
   # Allows you to run this workflow manually from the Actions tab
   workflow_dispatch:
@@ -17,7 +17,7 @@ permissions:
 # Allow only one concurrent deployment, skipping runs queued between the run in-progress and latest queued.
 # However, do NOT cancel in-progress runs as we want to allow these production deployments to complete.
 concurrency:
-  group: "pages"
+  group: 'pages'
   cancel-in-progress: false
 
 jobs:
@@ -30,7 +30,7 @@ jobs:
         run: mkdir build && cp -R slides/img build/img && cp -R slides/themes build/themes
 
       - name: Marp Build (README)
-        uses: docker://marpteam/marp-cli:v2.5.0
+        uses: docker://marpteam/marp-cli:latest
         with:
           args: --theme-set slides/themes -o build/index.html --html -- slides/Slides.md
         env:
@@ -44,4 +44,4 @@ jobs:
           path: 'build'
       - name: Deploy to GitHub Pages
         id: deployment
-        uses: actions/deploy-pages@v2
+        uses: actions/deploy-pages@v2