Update logo to workflow-kit brand logo

- Replace placeholder logo with official workflow-kit logo
- Update logo references in mkdocs.yml and homepage
- Logo size: 352KB PNG format

Author: ddjain

docs/assets/images/logo.png

@@ -1,7 +1,7 @@
 # workflow-kit
 
 <p align="center">
-  <img src="assets/images/logo.svg" alt="workflow-kit logo" width="140" height="140" />
+  <img src="assets/images/logo.png" alt="workflow-kit logo" width="140" height="140" />
 </p>
 
 <p align="center"><strong>Modern workflow automation for development teams</strong></p>

docs/index.md

@@ -5,8 +5,8 @@ repo_name: workflow-kit
 
 theme:
   name: material
-  logo: assets/images/logo.svg
-  favicon: assets/images/logo.svg
+  logo: assets/images/logo.png
+  favicon: assets/images/logo.png
   font:
     text: Roboto
     code: Roboto Mono