Fix typos, grammar issues, and UK English compliance

[mmmarinho]

This PR fixes spelling typos, grammatical issues, and ensures UK English compliance across all Jupyter notebooks and markdown files.

This PR was created by an AI agent (OpenHands) on behalf of the user.

Spelling Fixes

Typo	Correction	Files
instanteated / instanted	instantiated	lesson1_tutorial
shorthanded	shorthand	lesson1_tutorial
extremelly	extremely	lesson2_tutorial
homogenous	homogeneous	lesson2_tutorial, lesson3_tutorial
lenghts	lengths	lesson5_tutorial
reacheable	reachable	lesson5_tutorial
programatically	programmatically	lesson5_tutorial
pseudo-invese	pseudo-inverse	lesson5_tutorial
embbed	embed	lesson5_tutorial
milisecond	millisecond	lesson5_tutorial
pratice	practice	lesson5_tutorial
simultenously	simultaneously	lesson5_tutorial
forth → fourth	(ordinal number)	lesson2_tutorial
pre-requisites	prerequisites	all tutorial notebooks

Grammar Fixes

Issue	Correction	Files
can computed	can be computed	lesson1_tutorial
order of operations matter	order of operations matters	lesson2_exercise_answers
a list of list	a list of lists	lesson1_tutorial

UK English Compliance

US → UK	Files
behavior → behaviour	lesson5_tutorial
modeled → modelled	lesson3_tutorial
modeling → modelling	README.md, basic_lessons/README.md

Not Changed (intentionally)

• :align: center — MyST directive parameter, not prose text
• License: CC-BY-NC-SA — Formal Creative Commons title
• matricial — valid mathematical term used in academic contexts

Files Modified (12)

• README.md
• basic_lessons/README.md
• basic_lessons/lesson1_tutorial.ipynb
• basic_lessons/lesson1_exercise_answers.ipynb
• basic_lessons/lesson2_tutorial.ipynb
• basic_lessons/lesson2_exercise_answers.ipynb
• basic_lessons/lesson3_tutorial.ipynb
• basic_lessons/lesson3_exercise_answers.ipynb
• basic_lessons/lesson4_tutorial.ipynb
• basic_lessons/lesson4_exercise_answers.ipynb
• basic_lessons/lesson5_tutorial.ipynb
• basic_lessons/lesson5_exercise_answers.ipynb

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[mmmarinho]

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[mmmarinho]

This PR introduces a unstable/ directory containing all five lessons rewritten as text-only MyST notebooks (.md with {code-cell} directives), alongside the original .ipynb files in basic_lessons/.

What changed:

• Created unstable/ directory with 10 MyST text notebooks (5 tutorials + 5 exercise answers)
• Added unstable/myst.yml and unstable/README.md
• Fixed 3 additional typos: lesson3 "place and object" → "place an object", lesson5 "that is is" → "that this is", lesson5 "an PRR" → "a PRR"

Build verified: myst build --execute --html succeeded for all 11 pages.

(AI agent comment on behalf of the user.)

[mmmarinho]

Follow-up fix: Restored trailing newlines (\n) on all markdown cell source lines in the 5 tutorial notebooks.

The earlier typo-fix script inadvertently stripped trailing \n from cell source entries (e.g. "# L1 A quick Python refresher" instead of "# L1 A quick Python refresher\n"), which caused section headers to render as one concatenated line instead of properly separated paragraphs.

All 5 tutorial notebooks now render correctly with proper line breaks. The unstable/ MyST notebooks have also been regenerated.

(AI agent comment on behalf of the user.)

[mmmarinho]

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