Add installation guide and migration guide

[hcho3]

• Add doctest.

Installation guide

Migration guide

[coderabbitai]

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📝 Walkthrough

Walkthrough

Documentation updates migrate the FIL guide to nvForest, add installation instructions to the getting started page, and add the migration page to docs navigation.

Changes

Documentation updates

Layer / File(s)	Summary
FIL migration guide content docs/source/fil_migration.rst	Basic workflow example replaces FIL model loading/optimize with nvforest.load_from_sklearn and optimize, notes is_classifier is no longer needed, and replaces the FIL device-selection example with an nvForest snippet documenting device="auto" GPU-first/CPU-fallback behavior.
Getting started installation docs/source/getting_started.rst	Adds an Installation subsection with PyPI and Conda commands, plus a RAPIDS install note and link.
Docs index entries docs/source/index.rst	Adds fil_migration to the docs index list and toctree.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~5 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly matches the main change: adding installation and migration guides.
Description check	✅ Passed	The description is related to the docs changes and screenshots shown in the pull request.
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.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[coderabbitai]

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/fil_migration.rst`:
- Around line 23-28: The AFTER example in the nvforest migration snippet is
using the unoptimized nvforest_model for predict calls even though optimize()
returns a new model instance. Update the example so the result of
nvforest_model.optimize(batch_size=1024) is assigned back to nvforest_model, or
change the subsequent predict/predict_proba/predict_per_tree/apply calls to use
nvforest_model_optimized, keeping the usage consistent within the documented
flow.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Enterprise

Run ID: 657abeb1-04e2-45bb-815f-70e7028ebfee

📥 Commits

Reviewing files that changed from the base of the PR and between 5b9f052 and bfe7a09.

📒 Files selected for processing (3)

• docs/source/fil_migration.rst
• docs/source/getting_started.rst
• docs/source/index.rst

[jameslamb]

Left a couple small comments for your consideration, approving so you can merge without needing another review from me.

[hcho3]

/merge

[hcho3]

@csadorf @dantegd Can I get an approval for this pull request?