Some suggestions for making curve fitting blog post more easily understandable to a non-specialist

[ibnyusuf]

Following from our discussion on Zulip, below are some suggestions for the blog post Fitting cubic Bézier curves. I am posting them here so that they are not lost, but I understand that refining the blog post is not a priority of yours.

1. The blog post refers to 'image moment' and links to this Wikipedia page. From my current understanding, what is meant is 'first moment of area' and perhaps linking to this Wikipedia page may be more informative for those less familiar with the field.
2. It would be great to have the quartic polynomial on the blog page itself, rather than interested readers having to either derive it themselves, or obtain it from kurbo code / TypeDrawers discussion.
3. There is a corner case which the method outlined in the blog does not handle, namely when the start and end point are the same. Perhaps a note mentioning that this is not handled, and giving some hints on how it could be dealt with may be useful?