LE1 add doenets for vector operations

[StevenClontz]

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• source/linear-algebra: https://8d0a6b40.tbil.pages.dev/preview/linear-algebra
• source/linear-algebra/source/01-LE/01.ptx: https://8d0a6b40.tbil.pages.dev/preview/linear-algebra/LE1.html

[siwelwerd]

I like the idea. Would it make more sense to incorporate the interactives into examples though? Maybe Example 1.1.4 does addition algebraically and then the first interactive, and add an Example 1.1.5 that does scalar multiplication algebraically and then the second interactive.

[siwelwerd]

Do these need <descriptions> or are they otherwise navigable by screen readers?

[StevenClontz]

I am waiting on https://groups.google.com/g/pretext-a11y/c/PtHHq-CCBJo / https://discordapp.com/channels/1119039531564417084/1377810920079888456/1461070765406294048 to be answered so I can do this. Perhaps we can merge this as-is, but open an issue to add descriptions generally?

[siwelwerd]

Follow-up from our synchronous conversation: Each <interactive> should have a <description>. See also above suggestion about reorganizing into two examples.

[StevenClontz]

I like the idea. Would it make more sense to incorporate the interactives into examples though? Maybe Example 1.1.4 does addition algebraically and then the first interactive, and add an Example 1.1.5 that does scalar multiplication algebraically and then the second interactive.

I think it went well enough today that I'm going to keep it as-is for now.

[siwelwerd]

Stylistically I think maybe they still belong to the above example? Even if that's just moving the </example> down. Will approve and let you decide before merging though.

Perhaps we can merge this as-is, but open an issue to add descriptions generally?

Sounds good, throw your proposed <description> in a commit on #909 , and when we get an answer I'll handle them all together.