[change] Load netjsongraph.js from openwisp-utils

[nemesifier]

Depends on openwisp/openwisp-utils#517.

Goal: avoid duplicating static files with openwisp-monitoring, make loading more efficient.

[openwisp-companion]

Hi @kunalverma2512 👋,

Thank you for opening PR #298 to address this issue!

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To get assigned, please comment @openwisp-companion assign on this issue. Your comment satisfies GitHub's requirement and the bot will then assign the issue to you.

[kunalverma2512]

@openwisp-companion assign

[openwisp-companion]

This issue has been assigned to @kunalverma2512 who opened PR #298 to address it. 🎯