Updated browser wallet setup instructions to match new interface design

[TinaKT]

Purpose

Update the instructions for setting up the browser wallet to match the new interface design.

Changes

• Updated screenshots to show new layout.
• Revised navigation instructions to reflect new UI structure.
• Updated button names and instructions.
• Corrected workflows.

Checklist

• My code follows the style of this project.
• The code compiles without warnings.
• I have performed a self-review of the changes.
• I have documented my code, in particular the intent of the
  hard-to-understand areas.

By submitting the contribution I accept the terms and conditions of the
Contributor License Agreement v1.0

• link: https://developers.concordium.com/CLAs/Contributor-License-Agreement-v1.0.pdf

[Ivan-Mahda]

This is not related to current changes.
But for the future. Dark theme, makes images darker.
Which makes the new design not so good