feat: Update documentation to use logo.png instead of logo.svg

- Replace logo.svg with logo.png in Docusaurus config
- Add new logo.png and codeprismx.png files
- Remove deprecated logo.svg file
- Update favicon.ico and docusaurus.png files

The documentation site now uses the new PNG logo format for better
compatibility and visual consistency.

Author: milliondreams

codeprism-docs/docusaurus.config.ts

@@ -76,7 +76,7 @@ const config: Config = {
       title: 'CodePrism',
       logo: {
         alt: 'CodePrism Logo',
-        src: 'img/logo.svg',
+        src: 'img/logo.png',
       },
       items: [
         {