Updated badge URLs in README

[MocconaCoffee]

Category:

One of: Bugfix / Feature / Code style update / Refactoring Only / Build related changes / Documentation / Other (please specify)

• Documentation

Overview

Briefly outline your new changes...

• Fixed the broken link in the "Dashy on Docker Hub" badge URL
• Updated the GitHub Codespaces badge color for better visibility

Issue Number (if applicable) #00

New Vars (if applicable)

If you've added any new build scripts, environmental variables, config file options, dependency or devDependency, please outline here

Screenshot (if applicable)

If you've introduced any significant UI changes, please include a screenshot

Code Quality Checklist (Please complete)

• All changes are backwards compatible
• All lint checks and tests are passing
• There are no (new) build warnings or errors
• (If a new config option is added) Attribute is outlined in the schema and documented
• (If a new dependency is added) Package is essential, and has been checked out for security or performance
• (If significant change) Bumps version in package.json

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