Update incorrect Brave Search developer dashboard URL

[dhruska]

Description

This PR updates the Brave Search server README to fix an out of date URL pointing to the Brave API dashboard.

Server Details

• Server:
• Changes to:

Motivation and Context

This PR fixes a dead link.

How Has This Been Tested?

Manually as this is just a README change.

Breaking Changes

No

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update

Checklist

• I have read the MCP Protocol Documentation
• My changes follows MCP security best practices
• I have updated the server's README accordingly
• I have tested this with an LLM client
• My code follows the repository's style guidelines
• New and existing tests pass locally
• I have added appropriate error handling
• I have documented all environment variables and configuration options

Additional context

[olaservo]

Thank you!