docs: add new APDL resource link to learning and update external links

[germa89]

Description

Add a post about APDL.

Issue linked

NA

Checklist

• I have visited and read Develop PyMAPDL.
• I have tested my changes locally
• I have added necessary documentation or updated existing documentation.
• I have followed the PyMAPDL coding style guidelines.
• I have added appropriate unit tests that also ensure the minimal coverage criteria.
• I have reviewed my changes before submitting this pull request.
• I have linked the issue or issues that are solved to the PR if any.
• I have assigned this PR to myself.
• I have marked this PR as draft if it is not ready to be reviewed yet.
• I have made sure that the title of my PR follows Commit naming conventions (e.g. feat: adding new MAPDL command)

Summary by Sourcery

Add a new APDL learning resource link and update external links in documentation

Documentation:

• Add APDL resource link to the learning section
• Update external links in links.rst to latest URLs

[ansys-reviewer-bot]

Thanks for opening a Pull Request. If you want to perform a review write a comment saying:

@ansys-reviewer-bot review

[sourcery-ai]

Reviewer's Guide

This PR enriches the documentation by adding a new APDL resource entry to the learning guide and refreshing several external links to their current URLs.

File-Level Changes

Change	Details	Files
Add APDL resource link to learning overview	Insert new bullet entry pointing to the APDL post Include the APDL resource in the learning toctree list	doc/source/getting_started/learning.rst
Update external resource URLs	Replace outdated external URLs with their updated counterparts Adjust link text for consistency and clarity	doc/source/links.rst

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[sourcery-ai]

Hey @germa89 - I've reviewed your changes - here's some feedback:

• Add the new APDL post to the learning section’s toctree so it appears in the sidebar navigation.
• Include a brief description for the APDL resource in learning.rst to provide context instead of only a link.
• Check that the external links in links.rst adhere to the project’s reference link style and update any inconsistencies.

Prompt for AI Agents

Please address the comments from this code review:
## Overall Comments
- Add the new APDL post to the learning section’s toctree so it appears in the sidebar navigation.
- Include a brief description for the APDL resource in learning.rst to provide context instead of only a link.
- Check that the external links in links.rst adhere to the project’s reference link style and update any inconsistencies.

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[Copilot]

Pull Request Overview

This PR adds a new APDL learning resource to the “Recommended articles” section and reorganizes the external links in links.rst.

• Added an APDL article reference in learning.rst
• Resorted and updated external link anchors in links.rst

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
doc/source/links.rst	Alphabetized and updated external link definitions
doc/source/getting_started/learning.rst	Added APDL learning link under Recommended articles

Comments suppressed due to low confidence (1)

doc/source/getting_started/learning.rst:205

• Indent the new APDL bullet and its accompanying link to match the existing styling (two spaces before the * and four spaces before the link line).

* APDL: The Language of Simulation.

[germa89]

@pyansys-ci-bot LGTM.

[pyansys-ci-bot]

✅ Approving this PR because germa89 said so in here 😬

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.03%. Comparing base (eaf5df4) to head (7a29664).
Report is 6 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4067   +/-   ##
=======================================
  Coverage   89.02%   89.03%           
=======================================
  Files         187      187           
  Lines       14993    14993           
=======================================
+ Hits        13348    13349    +1     
+ Misses       1645     1644    -1     

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