removed older ci file

.github/workflows/scala.yml

@@ -1,23 +0,0 @@
-name: Scala CI
-
-on:
-  push:
-    branches: [ master ]
-  pull_request:
-    branches: [ master ]
-
-jobs:
-  build:
-
-    runs-on: ubuntu-latest
-
-    steps:
-    - uses: actions/checkout@v2
-    - name: Set up JDK 1.11
-      uses: actions/setup-java@v1
-      with:
-        java-version: 1.11
-    - name: Run tests
-      run: sbt test
-    - name: Run linter
-      run: sbt "scalafixAll --check"