Update docs homepage hero image (#3222)

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

.changeset/docs-homepage-hero.md

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+---
+"@tabler/docs": patch
+---
+
+Updated the hero image on the docs homepage with a new dashboard graphic for light and dark mode.

.changeset/docs-toc-width.md

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+---
+"@tabler/docs": patch
+---
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+Updated the table of contents rail on docs pages to a fixed `13rem` width.