chore(tabs): add a nested demo

[zeroedin]

What I did

1. Add a nested demo

Closes #1481

Testing Instructions

1. View nested demo

Notes to Reviewers

@eyevana here is a demo showing nested tabs working. The bug outlined in #1481 was fixed by our implementation changes from a tabs-controller to aria-tabs-controller upstream in pfe. patternfly/patternfly-elements#2699

Thanks for filling the issue!

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[github-actions]

Size Change: 0 B

Total Size: 250 kB

ℹ️ View Unchanged

Filename	Size
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./elements/rh-accordion/rh-accordion-header.js	3.75 kB
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./elements/rh-accordion/rh-accordion.js	3.71 kB
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./elements/rh-audio-player/rh-audio-player-button.css.js	434 B
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./lib/DirController.js	568 B
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./react/elements/rh-accordion/rh-accordion.js	216 B
./react/elements/rh-alert/rh-alert.js	188 B
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./react/elements/rh-audio-player/rh-cue.js	196 B
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./react/elements/rh-footer/rh-footer-links.js	187 B
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./react/elements/rh-footer/rh-global-footer.js	188 B
./react/elements/rh-menu/rh-menu.js	176 B
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./react/elements/rh-navigation-secondary/rh-navigation-secondary-menu-section.js	233 B
./react/elements/rh-navigation-secondary/rh-navigation-secondary-menu.js	225 B
./react/elements/rh-navigation-secondary/rh-navigation-secondary-overlay.js	202 B
./react/elements/rh-navigation-secondary/rh-navigation-secondary.js	239 B
./react/elements/rh-pagination/rh-pagination.js	181 B
./react/elements/rh-site-status/rh-site-status.js	182 B
./react/elements/rh-skip-link/rh-skip-link.js	184 B
./react/elements/rh-spinner/rh-spinner.js	177 B
./react/elements/rh-stat/rh-stat.js	176 B
./react/elements/rh-subnav/rh-subnav.js	178 B
./react/elements/rh-surface/rh-surface.js	178 B
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./react/elements/rh-table/rh-table.js	177 B
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./react/elements/rh-tabs/rh-tab.js	188 B
./react/elements/rh-tabs/rh-tabs.js	176 B
./react/elements/rh-tag/rh-tag.js	183 B
./react/elements/rh-tile/rh-tile-group.js	185 B
./react/elements/rh-tile/rh-tile.js	197 B
./react/elements/rh-timestamp/rh-timestamp.js	179 B
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_{compressed-size-action}

[eyevana]

lgtm <3