🌱 Format API JSON output

[spencerschrock]

Partially addresses #206

Originally proposed in ossf/scorecard#2251, but the JSON marshalling/unmarshalling in the webapp would overrule any change made there.

It's introduced as a flag, where the default is no indentation / pretty printing. This matches the current behavior.
I'm unfamiliar with CloudRun, so if it's hard to specify in the production deployment a static value can be used.

./scorecard-webapp -h
Usage:
  scorecard-server [OPTIONS]

OpenSSF Scorecard API

API to interact with a project's published Scorecard result

      --cleanup-timeout duration     grace period for which to wait before killing idle connections (default 10s)
      --graceful-timeout duration    grace period for which to wait before shutting down the server (default 15s)
      --host string                  the IP to listen on (default "localhost")
      --indent string                the indent used in json output (default no ident "")

...

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[naveensrinivasan]

@spencerschrock Can you please address the linter issues?

Thanks