CI/CD: Remove pipelines for Bitbucket.

We already have self-hosted Drone CI/CD, and free GitLab CI/CD. Besides
bitbucket offers only 52 minutes monthly.

Signed-off-by: Grzegorz Kowal <grzegorz@amuncode.org>

bitbucket-pipelines.yml

@@ -1,32 +0,0 @@
-image: debian
-
-pipelines:
-  default:
-    - step:
-        name: Build
-        script:
-          - apt -q update
-          - apt -q -y install gawk make gfortran libhdf5-dev libopenmpi-dev
-          - cd ./build
-          - cp -al make.default make.config
-          - cp -al ./hosts/default ./hosts/$HOSTNAME
-          - export HDF5DIR=/usr/lib/x86_64-linux-gnu/hdf5/serial
-          - make MPI=N NDIMS=2
-          - make clean
-          - make MPI=N NDIMS=3
-          - make clean
-          - make MPI=Y NDIMS=2
-          - make clean
-          - make MPI=Y NDIMS=3
-
-    - step:
-        name: Build with CMake
-        script:
-          - apt -q update
-          - apt -q -y install cmake gfortran libhdf5-dev libopenmpi-dev libzstd-dev liblz4-dev liblzma-dev pkg-config
-          - mkdir ./build-cmake/
-          - cd ./build-cmake/
-          - cmake -LA ..
-          - make
-          - cmake -LA -DENABLE_3D=Y ..
-          - make