docs: trim quick start, fix section anchors, clarify nlopt build

[yanziz-nvidia]

Summary

• Fix section ID links: add explicit .. _anchor: labels to all 7 steps so the local table of contents uses readable text hashes (#run-cloudxr-server, #whitelist-firewall-ports, etc.) instead of auto-generated #id1/#id2 anchors
• Step 2 ARM64 note → collapsible dropdown: x86_64 users no longer have to scroll past ARM64-specific content
• Collapse CloudXR Configurations (step 3 subsection) into a dropdown; remove the orphaned stale code block that followed it
• Step 5 Quest/Pico dropdown: renamed to "Meta Quest, PICO headset, or desktop browser" and restructured so the browser/IWER option leads rather than being buried in a tip; --host-client note moved to the top of the section
• Air-gapped/offline caching details moved into a nested dropdown (further reduces visual noise on the happy path)
• nlopt build comment (build_from_source/index.rst): explain why the venv Python version must match — nlopt builds a CPython ABI-specific extension binary, so 3.11 and 3.12 wheels are not interchangeable
• egocentric_hand_reconstruction.rst: replace hardcoded https://nvidia.github.io/IsaacTeleop/main/device/oak.html with a proper :doc: cross-reference so it resolves correctly on all branches/versions

Test plan

• Verify rendered quick_start page TOC links all use text-based anchors (no #id1)
• Confirm ARM64 dropdown and CloudXR configurations dropdown are collapsed by default
• Confirm step 5 dropdown leads with the browser/IWER option
• Confirm --host-client note cross-links correctly to step 3 and step 4 anchors
• Spot-check egocentric_hand_reconstruction page: OAK link resolves to /device/oak

🤖 Generated with Claude Code

Summary by CodeRabbit

• Documentation
  • Reorganized Quick Start guide with improved formatting and dropdown menus for clearer navigation
  • Clarified ARM64 build requirements regarding Python version compatibility
  • Enhanced internal cross-references between documentation sections
  • Updated guidance for XR headset configuration and offline deployment scenarios

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📝 Walkthrough

Walkthrough

This PR updates documentation across the Isaac Teleop repository. The build-from-source guide clarifies that ARM64 nlopt wheels require an exact Python version match due to CPython ABI specificity. The quick start guide is restructured with labeled section anchors and dropdown-style blocks for advanced topics like CloudXR configuration, XR headset setup, and offline deployment. The OAK camera documentation link is converted to an internal Sphinx reference, and several environment variable tables and fallback instructions are reformatted for clarity.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely summarizes the three main changes: documentation trimming, section anchor fixes, and nlopt build clarification—all of which are reflected in the actual file modifications.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
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Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@docs/source/getting_started/quick_start.rst`:
- Around line 211-213: The link target `nvidia.github.io/IsaacTeleop/client`_ is
missing a reference definition so Sphinx will render it broken; fix by replacing
the reference-style link with an inline external link (e.g.,
`https://nvidia.github.io/IsaacTeleop/client`) or add a corresponding reference
definition for `nvidia.github.io/IsaacTeleop/client`_ at the bottom of the
document; update the sentence that mentions IWER (Immersive Web Emulator
Runtime) to use the corrected inline URL or the new reference name so the
desktop-browser path resolves correctly.

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Fix all unresolved CodeRabbit comments on this PR:

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📥 Commits

Reviewing files that changed from the base of the PR and between b212cfb and 402b549.

📒 Files selected for processing (3)

• docs/source/getting_started/build_from_source/index.rst
• docs/source/getting_started/quick_start.rst
• docs/source/references/egocentric_hand_reconstruction.rst