Replace shell scripts with JS code

[lidel]

• Problem: ci/update-manifest.sh uses third party jq and that causes problems for contributors (Enable pinning when the ipfs daemon is in offline mode #790 (comment)).
• Fix: replace it with .js util that is platform-agnostic (we want good devexp on Windows) and relies on dev dependencies listed in package.json

[BrianBelhumeur]

I can take this one. The json package seems like a good candidate.

To be clear, the goal is to replace the just the jq util, rather than the entire ci/update-manifest.sh shell script, correct?

[lidel]

@BrianBelhumeur Ideally we would replace entire update-manifest.sh with update-manifest.js that does the same but removes the need for shell scripts, but if we remove jq that also good enough, gets us 80% where we want to be :)

[BrianBelhumeur]

Hey @lidel I'm actually going to hand this one back. I don't currently have the bandwidth for it.