[doc] Update documentation links and improve content in notebooks

[Routhleck]

This pull request updates various documentation files to fix outdated or incorrect URLs, ensuring they point to the correct locations in the saiunit documentation. The changes primarily involve removing /en/latest from the URLs and updating paths to match the current structure of the documentation.

Updates to Documentation URLs:

• General Documentation Links:

  • Updated the saiunit and brainunit README files to remove /en/latest from the ReadTheDocs links for documentation badges. (README.md: [1] brainunit/README.md: [2]

• Physical Units Documentation:

  • Fixed the link to the Quantity documentation in the FAQs to point to the correct path. (docs/FAQs.md: docs/FAQs.mdL95-R95)
  • Updated links in the math_operations_with_quantity and quantity notebooks to remove /en/latest and reflect the updated documentation structure. (docs/physical_units/math_operations_with_quantity.ipynb: [1] docs/physical_units/quantity.ipynb: [2] [3]

• Mathematical Functions Documentation:

  • Updated links in the fft_functions, lax_functions, linalg_functions, and numpy_functions notebooks to remove /en/latest and ensure paths align with the updated documentation structure. (docs/mathematical_functions/fft_functions.ipynb: [1] docs/mathematical_functions/lax_functions.ipynb: [2] docs/mathematical_functions/linalg_functions.ipynb: [3] docs/mathematical_functions/numpy_functions.ipynb: [4] [5] [6] [7] [8] [9] [10] [11]

• Advanced Tutorials:

  • Corrected the link to the advanced tutorial on combining and defining units. (docs/advanced_tutorials/mechanism.ipynb: docs/advanced_tutorials/mechanism.ipynbL66-R66)

These changes improve the accuracy and usability of the documentation by ensuring all links are functional and up-to-date.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request updates a broken link in the FAQ documentation. The old link pointed to a brainunit URL, but it should point to the saiunit URL.

No diagrams generated as the changes look simple and do not need a visual representation.

File-Level Changes

Change	Details	Files
Updated the URL for the Quantity documentation in the FAQ.	Replaced the old brainunit URL with the correct saiunit URL.	docs/FAQs.md

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[sourcery-ai]

Hey @Routhleck - I've reviewed your changes and they look great!

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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