[Docs] Instructions for how to refer to your local Sistent fork

[leecalcote]

Current State

While making changes in Sistent, then testing those changes in Meshery UI, contributors are commonly in need of instructions on how to refer to their local changes.

Desired State

Include this information (and example) in the README.

---

Contributor Guides and Resources

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