Permutate Scala3doc GH workflow

Author: abgruszecki

.github/workflows/scala3doc.yaml

@@ -8,11 +8,10 @@ on:
 jobs:
   build:
     runs-on: ubuntu-latest
-    container: lampepfl/dotty:2020-04-24
 
     steps:
       - name: Git Checkout
-      - uses: actions/checkout@v2
+        uses: actions/checkout@v2
 
       - name: Cache Coursier
         uses: actions/cache@v1