Remove travis-ci and github actions leftovers

.github/workflows/ccpp.yml

@@ -1,20 +0,0 @@
-name: Smoke test
-
-on: [push]
-
-jobs:
-  build:
-
-    runs-on: ubuntu-latest
-    
-    steps:
-    - uses: actions/checkout@v1
-    - name: configure
-      run: |
-        mkdir build && cd build && cmake ..
-    - name: build
-      run: |
-        make -j4
-    - name: test
-      run: | 
-        ctest -V