docs: fix logo rendering — transparent bg, hide site name text, resize

- Remove white background from logo PNG (make transparent)
- Add custom CSS to hide redundant site name text from header
- Increase logo height for better visibility
- Wire extra_css into mkdocs.yml

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: Aryamanz29

docs/assets/logo.png

@@ -0,0 +1,10 @@
+/* Hide site name text — logo image already contains the name */
+.md-header__title {
+  display: none;
+}
+
+/* Make logo bigger */
+.md-header__button.md-logo img {
+  height: 2.5rem;
+  width: auto;
+}

docs/assets/stylesheets/extra.css

@@ -40,6 +40,9 @@ theme:
     - content.tabs.link
     - announce.dismiss
 
+extra_css:
+  - assets/stylesheets/extra.css
+
 markdown_extensions:
   - admonition
   - pymdownx.details