moved README Helm file to documentation

[azhavoro]

Motivation and context

How has this been tested?

Checklist

• I submit my changes into the develop branch
• I have added a description of my changes into CHANGELOG file
• I have updated the documentation accordingly
• I have added tests to cover my changes
• I have linked related issues (read github docs)
• I have increased versions of npm packages if it is necessary (cvat-canvas,
  cvat-core, cvat-data and cvat-ui)

License

• I submit my code changes under the same MIT License that covers the project.
  Feel free to contact the maintainers if that's a concern.

[lszxyz]

Is there an extra "https"

[nmanovic]

@lszxyz , thanks for the note! Could you please contribute? You can just open the documentation page and fix the issue. We love contribution and want to see you in our contribution list!