inertia-1 transcription, wording and images edits

[Joosty]

I hope you don't mind me taking the liberty to do some transcription work on the inertia chapter (particularly the Mass/Inertia Scalars file) that I noticed needed to be done. Also fixed wording and images.

I saw an issue in the Theorems for Computing Inertia Matrix file so there will be a separate PR to follow.

Cheers,
Joost

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[angadhn]

Go for it! If the entire world was like you, then we'd probably already have more orbiting habitats and, hell, maybe even a nascent civilisation on Mars.

[angadhn]

might need to resync this as I just merged the other.. unsure if that is actually needed. I think I should revisit my git knowledge..

[Joosty]

resynced just in case.

[angadhn]

Right- so in this lecture, the all the ${bf P}_i$ need to be ${bf p}_i$. This is also when you expand them.

There are also cases where you have ${bf P}$, which needs to be ${bf p}$.

This is why handwritten stuff is bad, I guess 😄

[Joosty]

Will get going on that now, thanks for letting me know :)

[Joosty]

@angadhn should be done :) let me know if i missed anything, will be back in a few hours :)