removing old ci

.github/workflows/ubuntu18.yml

@@ -1,20 +0,0 @@
-name: Ubuntu 18.04 CI (GCC 7)
-
-on: [push, pull_request]
-
-jobs:
-  ubuntu-build:
-    runs-on: ubuntu-18.04
-    steps:
-      - uses: actions/checkout@v3
-      - name: Setup cmake
-        uses: jwlawson/actions-setup-cmake@v1.13
-        with:
-          cmake-version: '3.9.x'
-      - name: Use cmake
-        run: |
-          mkdir build &&
-          cd build &&
-          cmake  -DFAST_DOUBLE_BENCHMARKS=ON  .. &&
-          cmake --build . &&
-          ctest -j --output-on-failure

.github/workflows/vs16-ninja-ci.yml

@@ -1,25 +0,0 @@
-name: VS16-Ninja-CI
-
-on: [push, pull_request]
-
-jobs:
-  ci:
-    name: windows-vs16
-    runs-on: windows-latest
-    steps:
-    - uses: actions/checkout@v3
-    - name: 'Run CMake with VS16'
-      uses: lukka/run-cmake@v2
-      with:
-        cmakeListsOrSettingsJson: CMakeListsTxtAdvanced
-        cmakeListsTxtPath: '${{ github.workspace }}/CMakeLists.txt'
-        buildDirectory: "${{ github.workspace }}/../../_temp/windows"
-        cmakeBuildType: Release
-        buildWithCMake: true
-        cmakeGenerator: VS16Win64
-        cmakeAppendedArgs:  -G Ninja
-        buildWithCMakeArgs: --config Release  
-
-    - name: 'Run CTest'
-      run: ctest -C Release   --output-on-failure
-      working-directory: "${{ github.workspace }}/../../_temp/windows"