New UI and Logo

What's new ?

• Remove messy and bad code (PHP Insights, PHPStan and Psalm)
• Add Slim-Bridge for better dependency injection
• Refactor Admin UI with PicoCSS v2 & Nord theme
• Add custom RSS feed by tag
• Copy config.sample.json file instead of rename
• Small refactor of classes names
• Admin save() function refactor
• Temporary remove the off-chain pages routes
• Some Coding standards fixes
• Remove Themes and move them to superhive-themes repo

Full Changelog: v0.6.0...v0.7.0