Merge pull request #171 from ember-cli/migrate-to-npm

Author: Robert Jackson

.github/workflows/ci.yml

@@ -21,5 +21,5 @@ jobs:
       uses: actions/setup-node@v1
       with:
         node-version: ${{ matrix.node-version }}
-    - run: yarn install --frozen-lockfile
-    - run: yarn test
+    - run: npm ci
+    - run: npm test

RELEASE.md

@@ -33,7 +33,7 @@ Once the prep work is completed, the actual release is straight forward:
 * First, ensure that you have installed your projects dependencies:
 
 ```
-yarn install
+npm ci
 ```
 
 * Second, ensure that you have obtained a