[Tidy] Update dashboard layout

[huong-li-nguyen]

Description

• Closes several tasks from this ticket: https://github.com/McK-Internal/vizro-internal/issues/721
  • Reduce icon bar width
  • Reduce title bar height
  • Reduce width of control panel
  • Set height for logo
  • Consolidate default gaps
  • Align table titles with figure titles
  • Align accordion title with filter titles
  • Update accordion styling for active item
  • Add indentation to accordion
  • Reduce graph margins

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For reviewers

@Joseph-Perkins should be the main reviewer of the layout changes.

I would suggest to do the following:

• Run hatch run example demo and check the current version vs. vizro.mckinsey.com
• Run hatch run example demo but remove the logo from the assets folder and any custom CSS

Screenshot

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[nadijagraca]

Looks really sleek. 🚀