Improve README title and project description

Updated the README to enhance the project title and description.

Author: Leftium

README.md

@@ -1,7 +1,12 @@
-# nimble.css
+<div align="center"><img src="https://leftium.github.io/nimble.css/static/logo.svg" alt="nimble.css logo" width="200" />
+
+  # Nimble.css
+</div>
 
 Minimal CSS library for great-looking default HTML styles; no classes required. ~3.4 KB brotli (core).
 
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+
 - **Classless** — every standard HTML element elegantly styled without classes
 - **Dark mode** — included (automatic and manual)
 - **Cascade layers** — plays nicely alongside your own styles