[CI] Use `make`, not `npm` directly

[leecalcote]

Current Behavior

Direct use of npm is inconsistent with all of the other projects here.

Desired Behavior

1. Create make targets reusing the include() make files from meshery/meshery.
2. Follow the same target structure as other projects (e.g. make ui-setup; make ui-build; make site-setup; make site-build; make ui-lint).
3. Update the README and Contributing guide.
4. Update the GitHub workflows

Implementation

1. Create make targets reusing the include() make files from meshery/meshery.
2. Follow the same target structure as other projects (e.g. make ui-setup; make ui-build; make site-setup; make site-build; make ui-lint).
3. Update the README and Contributing guide.
4. Update the GitHub workflows

Acceptance Tests

1. Sistent workflows are using make.

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Contributor Guides and Resources

• 🛠 Meshery Build & Release Strategy
• 🎨 Wireframes and designs for Sistent site in Figma (open invite)
• 🙋🏾🙋🏼 Questions: Layer5 Discussion Forum and Layer5 Community Slack

[mdimado]

I'd like to work on this