MNEMONIC-612: Remove unused circleci configuration file from current project folder

Signed-off-by: Yanhui Zhao <yzhao@apache.org>
diff --git a/.circleci/config.yml b/.circleci/config.yml
deleted file mode 100644
index 7adc203..0000000
--- a/.circleci/config.yml
+++ /dev/null
@@ -1,40 +0,0 @@
-#
-# Licensed to the Apache Software Foundation (ASF) under one or more
-# contributor license agreements.  See the NOTICE file distributed with
-# this work for additional information regarding copyright ownership.
-# The ASF licenses this file to You under the Apache License, Version 2.0
-# (the "License"); you may not use this file except in compliance with
-# the License.  You may obtain a copy of the License at
-#
-#    http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-#
-
-version: 2
-jobs:
-  build:
-    working_directory: /ws/mnemonic
-    docker:
-      - image: mnemonic/mneci:v2
-    branches:
-      only:
-        - master
-    steps:
-      - run:
-          name: Clean up
-          command: |
-            rm -rf /ws/mnemonic
-      - checkout
-      - run:
-          name: Run tests
-          command: |
-            git log -1 --stat
-            git clean -xdf
-            mvn clean install
-#           the runall cannot be fulfilled using free plan since it needs more resource to run.
-#           tools/runall.sh