Implementing change of basis outcome in MX

[StevenClontz]

Closes #776

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• source/linear-algebra/exercises/outcomes/MX3: https://46869ab0.tbil.pages.dev/preview/linear-algebra/instructor/exercises/MX3/
• source/linear-algebra/exercises/outcomes/MX2: https://46869ab0.tbil.pages.dev/preview/linear-algebra/instructor/exercises/MX2/

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• source/linear-algebra/exercises/outcomes/MX3: https://f5bc08ad.tbil.pages.dev/preview/linear-algebra/instructor/exercises/MX3/
• source/linear-algebra/exercises/outcomes/MX2: https://f5bc08ad.tbil.pages.dev/preview/linear-algebra/instructor/exercises/MX2/

[jkostiuk]

I (believe) all that's needed now is to write a sample solution for MX2, and then this is ready for review. Can circle back tomorrow.
I'll update GT4 in a separate issue once this is all pushed/resolved.

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• linear-algebra: https://ff133826.tbil.pages.dev/preview/linear-algebra/instructor
• source/linear-algebra/source/04-MX/02.ptx: https://ff133826.tbil.pages.dev/preview/linear-algebra/instructor/MX2.html
• source/linear-algebra/source/04-MX/03.ptx: https://ff133826.tbil.pages.dev/preview/linear-algebra/instructor/MX3.html
• source/linear-algebra/source/05-GT/main.ptx: https://ff133826.tbil.pages.dev/preview/linear-algebra/instructor/GT.html
• source/linear-algebra/source/meta/sample-exercises.ptx: https://ff133826.tbil.pages.dev/preview/linear-algebra/instructor/sample-exercises.html
• source/linear-algebra/exercises/outcomes/MX3: https://ff133826.tbil.pages.dev/preview/linear-algebra/instructor/exercises/MX3/
• source/linear-algebra/exercises/outcomes/MX2: https://ff133826.tbil.pages.dev/preview/linear-algebra/instructor/exercises/MX2/

[jkostiuk]

@StevenClontz I think I'm all set here. I can't ask for your review because you're the author. If you or @siwelwerd could take a look, I'd be happy to build any additional changes (though i don't know how to resolve conflicts with the requirements.txt).

Will address modifications to GT4 in a separate PR.

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• linear-algebra: https://028eeb38.tbil.pages.dev/preview/linear-algebra/instructor
• source/linear-algebra/source/04-MX/02.ptx: https://028eeb38.tbil.pages.dev/preview/linear-algebra/instructor/MX2.html
• source/linear-algebra/source/04-MX/03.ptx: https://028eeb38.tbil.pages.dev/preview/linear-algebra/instructor/MX3.html
• source/linear-algebra/source/05-GT/main.ptx: https://028eeb38.tbil.pages.dev/preview/linear-algebra/instructor/GT.html
• source/linear-algebra/source/meta/sample-exercises.ptx: https://028eeb38.tbil.pages.dev/preview/linear-algebra/instructor/sample-exercises.html
• source/linear-algebra/exercises/outcomes/MX3: https://028eeb38.tbil.pages.dev/preview/linear-algebra/instructor/exercises/MX3/
• source/linear-algebra/exercises/outcomes/MX2: https://028eeb38.tbil.pages.dev/preview/linear-algebra/instructor/exercises/MX2/