docs(theming): some styling and content updates

[markcaron]

What I did

1. Some styling and content updates to the "Backgrounds and theme tokens" section of Theming —> Color palettes

Close #1979

Testing Instructions

Waiting on #1972 so the use of rh-surface in the color palettes section is fixed.

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Latest commit: 5261bc8

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Size Change: 0 B

Total Size: 211 kB

ℹ️ View Unchanged

Filename	Size
./elements.js	473 B
./elements/rh-accordion/context.js	162 B
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./lib/context/color/controller.js	947 B
./lib/context/color/provider.js	2.18 kB
./lib/context/event.js	593 B
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./react/rh-accordion/rh-accordion.js	215 B
./react/rh-alert/rh-alert.js	184 B
./react/rh-audio-player/rh-audio-player-about.js	191 B
./react/rh-audio-player/rh-audio-player-rate-stepper.js	213 B
./react/rh-audio-player/rh-audio-player-scrolling-text-overflow.js	214 B
./react/rh-audio-player/rh-audio-player-subscribe.js	196 B
./react/rh-audio-player/rh-audio-player.js	183 B
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./react/rh-button/rh-button.js	174 B
./react/rh-card/rh-card.js	172 B
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./react/rh-cta/rh-cta.js	170 B
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./react/rh-footer/rh-footer-block.js	184 B
./react/rh-footer/rh-footer-copyright.js	187 B
./react/rh-footer/rh-footer-links.js	185 B
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./react/rh-footer/rh-footer-universal.js	188 B
./react/rh-footer/rh-footer.js	174 B
./react/rh-health-index/rh-health-index.js	184 B
./react/rh-icon/rh-icon.js	202 B
./react/rh-menu/rh-menu.js	173 B
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./react/rh-navigation-secondary/rh-navigation-secondary-menu-section.js	205 B
./react/rh-navigation-secondary/rh-navigation-secondary-menu.js	199 B
./react/rh-navigation-secondary/rh-navigation-secondary-overlay.js	201 B
./react/rh-navigation-secondary/rh-navigation-secondary.js	213 B
./react/rh-pagination/rh-pagination.js	178 B
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./react/rh-skip-link/rh-skip-link.js	181 B
./react/rh-spinner/rh-spinner.js	175 B
./react/rh-stat/rh-stat.js	171 B
./react/rh-subnav/rh-subnav.js	175 B
./react/rh-surface/rh-surface.js	175 B
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./react/rh-tabs/rh-tabs.js	174 B
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./react/rh-tile/rh-tile.js	194 B
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_{compressed-size-action}

[markcaron]

Waiting on patch release: #1972