Standardize seealso admonitions with JAX template and intersphinx references

[Copilot]

This PR standardizes the seealso admonitions at the beginning of lectures to follow a consistent pattern using JAX references and intersphinx cross-references.

Changes Made

Before:

• wealth_dynamics.md had redundant text with duplicate URL links
• newton_method.md included technical details and a "GPU:" prefix
• All links used hardcoded URLs to JAX lectures
• Inconsistent wording and formatting between admonitions

After:
Both files now use the same clean, standardized template with proper intersphinx references:

```{seealso}
A version of this lecture using [JAX](https://github.com/jax-ml/jax) is {doc}`available here <jax:lecture_name>`
```

Infrastructure Updates:

• Added JAX intersphinx mapping to lectures/_config.yml for proper cross-referencing
• Converted all hardcoded JAX lecture URLs to use {doc} intersphinx references
• Updated additional JAX reference in newton_method.md for consistency

Files Modified

1. lectures/_config.yml - Added JAX intersphinx mapping
2. lectures/wealth_dynamics.md - Updated seealso admonition and converted URL to intersphinx reference
3. lectures/newton_method.md - Updated seealso admonition and converted all JAX URLs to intersphinx references

The standardized format now provides a consistent user experience and better maintainability through proper Sphinx cross-referencing.

Fixes #580.

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[mmcky]

• @mmcky update these links to use doc and inter sphinx.

[mmcky]

@copilot can we use the following standardised template

A version of this lecture using [JAX](https://github.com/jax-ml/jax) is [available here](URL)

[Copilot]

• @mmcky update these links to use doc and inter sphinx.

Updated the links to use doc and intersphinx as requested. Added JAX intersphinx mapping to _config.yml and converted all hardcoded JAX lecture URLs to intersphinx references using {doc} format. (commit d11b946)

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• jax.quantecon.org
  • Triggering command: curl -s REDACTED (dns block)
  • Triggering command: curl -s -I REDACTED (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

[Copilot]

@copilot can we use the following standardised template

...

Updated both seealso admonitions to use the standardized template with JAX reference as requested. The format now includes the JAX link and uses intersphinx {doc} references for better maintainability. (commit d11b946)

[mmcky]

• intersphinx mappings added
• seealso is now standardised in this lecture series.

[github-actions]

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