Add Isaac Sim Fundamentals Guide to Simulation Wiki

[ShubhJain007]

Explores the architecture of Isaac Sim projects, including USD organization, Python scripting for simulation control, robot model conversion, OmniGraph fundamentals, extension development, synthetic data generation with Replicator, MoveIt 2 integration, and large-scale RL training.

[p-amyjiang]

Content approved - Amy

[nevalsar]

Thanks for the contribution. The content quality is strong, but I want to make sure we handle the overlap with an existing Isaac Sim intro page at wiki/simulation/an-introduction-to-isaac-sim/. Please update this PR to clearly position the new page as an advanced companion rather an another introduction. I'm open to how you want to approach this - you can also edit both pages to make the intent and focus for each is clear.

At the minimum, these are the required changes:

1. Retitle the new page and nav/index entry to emphasize advanced scope (for example: “NVIDIA Isaac Sim Advanced Concepts and Workflows”).
2. Add a short “When to use this guide” note near the top that explicitly distinguishes it from the setup guide and links to /wiki/simulation/simulation-isaacsim-setup/.
3. Keep titles consistent across:
   • _data/navigation.yml
   • wiki/simulation/index.md
   • page front matter in wiki/simulation/isaac-sim-fundamentals.md
     (there is inconsistency currently between em dashes and hyphens)

Once those are updated, I can re-review quickly.

[nevalsar]

Structurally good, but need to integrate content with existing.