DOC: Add short_title for better navbar rendering.

This enables shorter titles in the left navigation bar of the
site, which is a minor improvement in readability (cuts down
on the amount of vertical space used per item in the dropdowns!).

Author: rossbar

content/mooreslaw-tutorial.md

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+short_title: Moore's Law
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     extension: .md

content/save-load-arrays.md

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+short_title: Sharing Array Data
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content/tutorial-air-quality-analysis.md

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+short_title: Analyzing Air Quality
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   formats: ipynb,md:myst
   text_representation:

content/tutorial-static_equilibrium.md

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+short_title: Static Equilibrium
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content/tutorial-style-guide.md

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+short_title: Style Guide
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content/tutorial-svd.md

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+short_title: Linear Algebra on n-D arrays
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     extension: .md