fix: remove debug tool

[abaicus]

All Submissions:

• Have you followed the Optimole Contributing guideline?
• Does your code follow the WordPress' coding standards?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?

Changes proposed in this Pull Request:

• Removes debug tools;
• Enhances ui consistency for main dashboard page;
• Fixes metrics formatting on the main dashboard page;
• Fixes dashboard spacing;

Previous version:

This version:

Closes Codeinwp/optimole-service#1391.

How to test the changes in this Pull Request:

1. The debug option should not be available anymore in the dashboard settings page;
2. Even if enabled in a previous version, it should not show up on the admin bar;
3. Dashboard main page should look as expected;

Other information:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your changes, as applicable?
• Have you successfully ran tests with your changes locally?

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