feat: new logo with background (#6062)

Author: ariarzer

README.md

@@ -1,5 +1,5 @@
 <p align="center">
-  <a href="https://cube.dev?ref=github-readme"><img src="https://raw.githubusercontent.com/cube-js/cube.js/master/docs/content/cube-logo.png" alt="Cube — Semantic Layer for Data Applications" width="300px"></a>
+  <a href="https://cube.dev?ref=github-readme"><img src="https://raw.githubusercontent.com/cube-js/cube.js/master/docs/content/cube-logo-with-bg.png" alt="Cube — Semantic Layer for Data Applications" width="300px"></a>
 </p>
 
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