Bump node to 16 and npm (#575)

* Bump engines required to node 16 and npm 8

* Bump @types/node to 16
The dep on node 14.18 will get cleaned up once we bump electron

* Modify build.yml to build with node 16 and npm 8

* Update requirements in README.md

* Remove install step for npm 8
npm v8.1.2 is included in node v16

* Rename install step

* Fixed typo

.github/workflows/build.yml

@@ -33,11 +33,10 @@ jobs:
       - name: Set up Node
         uses: actions/setup-node@46071b5c7a2e0c34e49c3cb8a0e792e86e18d5ea
         with:
-          node-version: '14'
+          node-version: '16'
 
-      - name: Update NPM
+      - name: Install node-gyp
         run: |
-          npm install -g npm@7
           npm install -g node-gyp
           node-gyp install $(node -v)