remove github ci

.github/workflows/ccpp.yml

@@ -1,17 +0,0 @@
-name: C/C++ CI
-
-on: [push]
-
-jobs:
-  build:
-
-    runs-on: ubuntu-latest
-    
-    steps:
-    - uses: actions/checkout@v2
-    - name: make
-      run: make
-    - name: make test
-      run: make test
-    - name: make clean
-      run: make clean