Add the local-fake-gpu-using-nvml

[maishivamhoo123]

What does this PR do?

Close : #445
Adds a new lab (lab3-hami-nvml-mock.md) that guides users through setting up a local HAMi + nvml‑mock environment without a real GPU.

The lab covers:

• Creating a kind cluster and deploying nvml‑mock to simulate 8 GPUs
• Building HAMi from main (with the nvidia-mig-parted fix already merged)
• Testing basic GPU scheduling, sharing, memory/core limits, and multi‑GPU allocation

All steps are verified and include exact commands and expected outputs.

Why is this needed?

Many contributors and users want to explore HAMi’s scheduling features without access to physical GPU hardware. This lab provides a reproducible, no‑cost environment for learning and validating HAMi’s behaviour.

How was it tested?

• Executed step‑by‑step on a local kind cluster with nvml‑mock v0.0.80 and HAMi built from main.
• All pod scheduling and annotation checks passed successfully.

[hami-robot]

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This pull-request has been approved by: maishivamhoo123
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[rootsongjc]

The admonitions weren't closing because the ::: end marker shared a line with the content, so MD never recognized them as closed and swallowed everything after into one giant nested block; fix it by putting each ::: open and close marker on its own line.