docs(readme): remove underscored spaces between badges

[rich-ayr]

Description

This PR removes additional characters between each badge.

Motivation and Context

Underscored spaces don't look very nice.

See also: Explanation on why the browser emits extra whitespaces for <a href="..."><img> sequences with linebreaks

How Has This Been Tested?

Browser.

Screenshots / Logs (if applicable)

Before PR

After PR

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 (no code change)
• Refactor (refactoring production code)
• Other

Checklist:

• My code follows the code style of this project.
• I have updated the documentation accordingly.
• I have formatted the code with rustfmt.
• I checked the lints with clippy.
• I have added tests to cover my changes.
• All new and existing tests passed.

[welcome]

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[orhun]

Thanks for attention in detail :)

[welcome]

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