Remove coverage artifact handling

.circleci/config.yml

@@ -147,15 +147,8 @@ jobs:
       - run:
           name: "Prepare Artifacts for Upload"
           command: |
-            mv $(nix-shell shell.nix --run "stack path --local-hpc-root") /tmp
             mv $(nix-shell shell.nix --run "stack path --local-doc-root")/PaymentServer-* /tmp/PaymentServer-docs
 
-      - store_artifacts:
-          # This contains the html coverage report as well as the raw data in
-          # .tix format.
-          path: "/tmp/hpc"
-          destination: "coverage"
-
       - store_artifacts:
           # This contains the html haddock output for the project.
           path: "/tmp/PaymentServer-docs"