Update README with responsive logo images

Added responsive logo images for dark and light themes.

README.md

@@ -1,3 +1,9 @@
+<picture>
+  <source media="(prefers-color-scheme: dark)" srcset="https://github.com/flightphp/docs/blob/redesigned-logos/public/images/redesign/logo+icon+slogan@dark.jpg?raw=true" />
+  <source media="(prefers-color-scheme: light)" srcset="https://raw.githubusercontent.com/flightphp/docs/refs/heads/redesigned-logos/public/images/redesign/logo%2Bicon%2Bslogan%40light.jpg" />
+  <img alt="Flight PHP Logo" src="https://raw.githubusercontent.com/flightphp/docs/refs/heads/redesigned-logos/public/images/redesign/logo%2Bicon%2Bslogan%40light.jpg" width="100%" />
+</picture>
+
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