Remove circleci workflow

.circleci/config.yml

@@ -1,15 +0,0 @@
-version: 2
-jobs:
-  build:
-    docker:
-      - image: rustlang/rust:nightly
-    steps:
-      - run: apt -y update --fix-missing
-      - run: apt -y install cmake
-      - checkout
-      - run: git submodule update --init --recursive
-      - run: cargo build
-      - run: cd examples && ./test.sh
-      - run: |
-          git clean -dfx
-          cargo build --no-default-features --features cmake