Delete .circleci directory

the config.yml file calls the non-existent file ./package/conda/run_docker_build.sh

.circleci/config.yml

@@ -1,19 +0,0 @@
-version: 2
-
-jobs:
-  build:
-    working_directory: ~/test
-    machine: true
-    steps:
-      - checkout
-      - run:
-          command: docker pull condaforge/linux-anvil
-      - run:
-          # Run, test and (if we have a BINSTAR_TOKEN) upload the distributions.
-          command: ./package/conda/run_docker_build.sh
-
-workflows:
-  version: 2
-  build_and_test:
-    jobs:
-      - build