Add engines object to package.json

- Add node-check-version to be called on serve and build scripts to
warn user that the correct version of node is not running
- Run npm audit fix to resolve 1532 vulnerabilities
- Add .npmrc file that will adds new npm packages as the exact version.
This settings assures that the ^ is not used when adding the package to
the packacge.json file.

This is to assure that we are running the correct version of node
that will not update the package-lock.json file when installing new
packages. We are using lts/erbium version of node that is 12.16.1
allowing any patch version beyond .1.

Signed-off-by: Derick Montague <[email protected]>
Change-Id: I564527c4d9a3946f4c7f08338f1d7ec111d9eb20

Author: derick-montague

.npmrc

@@ -0,0 +1 @@
+save-exact=true