Update all `npm` compile steps to yarn + remove package-lock.json

[parkedwards]

It's a better practice to use either yarn or npm for dependency builds, but not both.

Requirements:

• update all npm build or npm run build steps to use yarn
• remove package-lock.json so that only yarn.lock remains

[parkedwards]

@ashokponkumar I can take a crack at this too while I'm at it

[ashokponkumar]

That would be great @parkedwards

[ashokponkumar]

Also, if there are any more enhancements that you believe would improve the quality of the project, please do suggest.

[HarikrishnanBalagopal]

Going with yarn because of https://github.com/konveyor/move2kube-ui/issues/15