Updates UV documentation to be experimental

[kellyguo11]

Description

Since UV is a relatively new installation method that has not yet gone through rigorous testing, this PR marks it as an experimental approach until we have fully tested the various installation methods.

Type of change

• Documentation update

Checklist

• I have read and understood the contribution guidelines
• I have run the pre-commit checks with ./isaaclab.sh --format
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• I have updated the changelog and the corresponding version in the extension's config/extension.toml file
• I have added my name to the CONTRIBUTORS.md or my name already exists there

[greptile-apps]

Greptile Overview

Greptile Summary

This PR appropriately marks UV as an experimental installation method by reordering documentation tabs and adding "(experimental)" labels.

Key changes:

• Reordered virtual environment tabs in installation guides: Conda first, venv second, UV last
• Added "(experimental)" designation to all UV tab labels across three documentation files
• No functional code changes, only documentation reorganization

The changes are consistent and well-executed. The tab reordering successfully deprioritizes UV while keeping it available for users who want to try the newer package manager.

Confidence Score: 5/5

• This PR is safe to merge with no risk
• Documentation-only change that correctly reorganizes virtual environment installation tabs and adds experimental labels without any functional impact
• No files require special attention

Sequence Diagram

sequenceDiagram
    participant User as Documentation User
    participant Docs as Documentation Files
    participant VenvChoice as Environment Choice
    
    User->>Docs: Read installation guide
    Docs->>VenvChoice: Present environment options
    Note over VenvChoice: Tab order changed:<br/>1. Conda (stable)<br/>2. venv (standard)<br/>3. UV (experimental)
    VenvChoice->>User: Show Conda first (recommended)
    VenvChoice->>User: Show venv second (standard)
    VenvChoice->>User: Show UV last with experimental label
    User->>VenvChoice: Select preferred environment
    VenvChoice->>User: Provide installation instructions

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