Fix: all links in MLDA Intro Page

[pseudo-nerd]

Fix: Update Broken Links in MLDA Sampler Introduction Page

Summary
solving issue #682
This PR addresses two broken links in the MLDA (Multilevel Delayed Acceptance) sampler introduction and resources page.

Description
Two links in the MLDA sampler introduction page were pointing to non-existent locations. This PR updates these links to their correct destinations, ensuring users can access the intended resources.

Changes Made

• Updated the link for MLDA benchmarks and tuning notebook
• Updated the link for MLDA adaptive error model notebook

Details of Fixed Links

1. MLDA benchmarks and tuning notebook:

   • Old (broken) link: https://github.com/alan-turing-institute/pymc/blob/mlda_all_notebooks/docs/source/notebooks/MLDA_benchmarks_tuning.ipynb
   • New (correct) link: https://github.com/alan-turing-institute/pymc3/blob/mlda_all_notebooks/docs/source/notebooks/MLDA_benchmarks_tuning.ipynb

2. MLDA adaptive error model notebook:

   • Old (broken) link: https://github.com/alan-turing-institute/pymc/blob/mlda_all_notebooks/docs/source/notebooks/MLDA_adaptive_error_model.ipynb
   • New (correct) link: https://github.com/alan-turing-institute/pymc3/blob/mlda_all_notebooks/docs/source/notebooks/MLDA_adaptive_error_model.ipynb

Also I have updated the links in both .md and .ipynb file.

Please review the changes and merge it if all looks good. Thank you!

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📚 Documentation preview 📚: https://pymc-examples--683.org.readthedocs.build/en/683/

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[OriolAbril]

This PR includes the non-sensical code from #681.

[pseudo-nerd]

Hii @OriolAbril ,
Sorry for the confusion, I have updated the commit and removed the unneccesary code.
Please review it and let me know if any more changes are needed.
Thanks!