feat: update logo

Author: kamilbaczek

Chapter-1-initial-architecture/README.adoc

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 ++++
 <div align="center">
-  <img src="../Assets/ea_banner.png" width="350" align="center" height="350" alt="ea banner">
+  <picture>
+    <source srcset="../Assets/ea_banner_dark.png" media="(prefers-color-scheme: dark)">
+    <source srcset="../Assets/ea_banner_light.png" media="(prefers-color-scheme: light)">
+    <img src="../Assets/ea_banner_light.png" width="350" height="350" alt="ea banner">
+  </picture>
 </div>
 ++++
 

Chapter-2-modules-separation/README.adoc

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 ++++
 <div align="center">
-  <img src="../Assets/ea_banner.png" width="350" align="center" height="350" alt="ea banner">
+  <picture>
+    <source srcset="../Assets/ea_banner_dark.png" media="(prefers-color-scheme: dark)">
+    <source srcset="../Assets/ea_banner_light.png" media="(prefers-color-scheme: light)">
+    <img src="../Assets/ea_banner_light.png" width="350" height="350" alt="ea banner">
+  </picture>
 </div>
 ++++
 

Chapter-3-microservice-extraction/README.adoc

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 ++++
 <div align="center">
-  <img src="../Assets/ea_banner.png" width="350" align="center" height="350" alt="ea banner">
+  <picture>
+    <source srcset="../Assets/ea_banner_dark.png" media="(prefers-color-scheme: dark)">
+    <source srcset="../Assets/ea_banner_light.png" media="(prefers-color-scheme: light)">
+    <img src="../Assets/ea_banner_light.png" width="350" height="350" alt="ea banner">
+  </picture>
 </div>
 ++++
 

Chapter-4-applying-tactical-domain-driven-design/README.adoc

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 ++++
 <div align="center">
-  <img src="../Assets/ea_banner.png" width="350" align="center" height="350" alt="ea banner">
+  <picture>
+    <source srcset="../Assets/ea_banner_dark.png" media="(prefers-color-scheme: dark)">
+    <source srcset="../Assets/ea_banner_light.png" media="(prefers-color-scheme: light)">
+    <img src="../Assets/ea_banner_light.png" width="350" height="350" alt="ea banner">
+  </picture>
 </div>
 ++++