[Backport] Update Visualization Docs (#7054) (#7555)

# Description

Backports #7054 to `release/3.0.0`.

The [automatic backport
run](https://github.com/isaac-sim/IsaacLab/actions/runs/33827527258)
selected the PR and completed the cherry-pick, but its exact-patch
validator then failed because this source path was omitted as a no-op:


`source/isaaclab_rl/changelog.d/maximiliank-skip-unsupported-checkpoint-presets.skip`

That fragment is already present on `release/3.0.0` as the same empty
blob (`e69de29bb2d1d6434b8b29ae775ad8c2e48c5391`). The repository's
non-exact backport validation confirms that every other source path is
preserved and reports this as the only `missing_paths_already_present`
entry. No conflict resolution or manual source edits were required.

| Field | Commit |
|---|---|
| Original merged change | `7cc829274ce6050dc8288f2ea93f2b5c2175dd38` |
| Release base | `2af02510c` |
| Backport commit | `1c599e23aa51f0ba81922d2c1af3cddbb07b4b09` |

## Type of change

- Bug fix (non-breaking change which fixes an issue)
- Documentation update

## Validation

- Repository backport candidate validation passed; the only omitted
source path is the already-identical empty `.skip` fragment described
above.
- Full changed-file pre-commit suite passed, including changelog and Git
LFS checks.
- `sphinx-lint` reported no problems for added and modified RST files.
- Focused visualizer tests and the warning-as-error docs build are
pending release CI because the repository lockfile does not support the
local macOS/arm64 platform.

## Checklist

- [x] I have read and understood the [contribution
guidelines](https://isaac-sim.github.io/IsaacLab/main/source/refs/contributing.html)
- [x] I have run the applicable pre-commit checks
- [x] I have made corresponding changes to the documentation
- [ ] My changes generate no new warnings (full build pending Linux CI)
- [ ] I have run the focused tests (pending Linux CI)
- [x] Source changelog fragments are preserved
- [x] The original contributor is already listed in `CONTRIBUTORS.md`

Signed-off-by: matthewtrepte <mtrepte@nvidia.com>
Signed-off-by: Kelly Guo <kellyg@nvidia.com>
Co-authored-by: matthewtrepte <mtrepte@nvidia.com>

Author: kellyguo11

.github/workflows/check-links.yml

@@ -112,6 +112,7 @@ jobs:
           --exclude 'andrew\.cmu\.edu/course/10-703/textbook/BartoSutton\.pdf'
           --exclude 'www\.nvidia\.com/en-us/security'
           --exclude 'bostondynamics\.com/reinforcement-learning-researcher-kit'
+          --exclude 'opensource\.org'
           --exclude 'ros\.org'
           --max-retries 5
           --retry-wait-time 10

docs/conf.py

@@ -328,6 +328,7 @@ def _read_pinned_versions() -> dict:
 html_static_path = [
     "source/_static/css",
     "source/_static/how-to",
+    "source/_static/visualizers",
     "source/_static/tasks/previews",
     "source/_static/benchmarks",
 ]

docs/index.rst

@@ -102,6 +102,8 @@ Table of Contents
    source/concepts/backends_and_presets
    source/concepts/actuators
    source/concepts/coupled_solvers
+   source/concepts/scene_data_providers
+   source/concepts/visualization
    source/concepts/reinforcement_learning
 
 
@@ -140,6 +142,9 @@ Table of Contents
    source/features/population_based_training
    source/features/ray
    source/features/reproducibility
+   source/features/draw_markers
+   source/features/record_video
+   source/features/visualizer_tiled_camera
 
 
 .. toctree::

docs/source/_static/css/custom.css

@@ -187,3 +187,11 @@ figure.nurec-gif-contain img {
 button.copybtn {
     opacity: 1;
 }
+
+/* Force readable code-block text in dark mode; some rendering paths were
+   showing unstyled text in a dark color against the dark code background. */
+html[data-theme="dark"] pre,
+html[data-theme="dark"] .highlight,
+html[data-theme="dark"] .highlight pre {
+    color: #ffffff !important;
+}