[material-ui][docs] Update Figma plugin name

[danilo-leal]

• [x] I have followed (at least) the PR section of the contributing guide.

As per the discussion recently had on this shaping page. Here are the tasks for this PR:

• [x] Update mentions to "Connect" to say "Sync" (or similar)
• [x] Update link URLs
• [x] Update images directory names
• [x] Update images themselves
• [x] Update blog post videos

In parallel, we're also updating the plugin itself.

Pages updated:

• https://deploy-preview-41967--material-ui.netlify.app/material-ui/getting-started/design-resources/
• https://deploy-preview-41967--material-ui.netlify.app/material-ui/design-resources/material-ui-for-figma/
• https://deploy-preview-41967--material-ui.netlify.app/material-ui/design-resources/material-ui-sync/
• https://deploy-preview-41967--material-ui.netlify.app/blog/introducing-sync-plugin/

[mui-bot]

Netlify deploy preview

• docs/data/material/design-resources/material-ui-for-figma/material-ui-for-figma.md
• docs/data/material/design-resources/material-ui-sync/material-ui-sync.md
• docs/data/material/getting-started/design-resources/design-resources.md

Bundle size report

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