remove and optimize images

pages/assets/img/spring-logo.svg

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pages/index.adoc

@@ -58,7 +58,7 @@ image::./assets/img/blog-openliberty.png[]
 [discrete]
 === Book
 
-image::./assets/img/book-taming-thymeleaf.jpg[]
+image::./assets/img/book-taming-thymeleaf.png[]
 --
 
 [.tab]