chore: set hanzoai.github.io/docs as canonical URL and fix branding

- Replace docs.hanzo.ai with hanzoai.github.io/docs across 65+ files
  (metadata, package.json homepages, READMEs, examples, templates, content)
- Update twitter creator from @fuma_nama to @hanzoai
- Update baseUrl to use GitHub Pages URL instead of Vercel env var
- Update RSS feed base URL

examples/python/content/docs/index.mdx

@@ -9,5 +9,5 @@ Welcome to the docs! You can start writing documents in `/content/docs`.
 
 <Cards>
   <Card title="Learn more about Next.js" href="https://nextjs.org/docs" />
-  <Card title="Learn more about Hanzo Docs" href="https://docs.hanzo.ai" />
+  <Card title="Learn more about Hanzo Docs" href="https://hanzoai.github.io/docs" />
 </Cards>

examples/python/lib/source.ts

@@ -1,7 +1,7 @@
 import { docs } from '@hanzo/docs/mdx:collections/server';
 import { loader } from '@hanzo/docs/core/source';
 
-// See https://docs.hanzo.ai/docs/headless/source-api for more info
+// See https://hanzoai.github.io/docs/docs/headless/source-api for more info
 export const source = loader({
   // it assigns a URL to your pages
   baseUrl: '/docs',

examples/python/source.config.ts

@@ -1,6 +1,6 @@
 import { defineConfig, defineDocs } from '@hanzo/docs/mdx/config';
 
-// Options: https://docs.hanzo.ai/docs/mdx/collections#define-docs
+// Options: https://hanzoai.github.io/docs/docs/mdx/collections#define-docs
 export const docs = defineDocs({
   dir: 'content/docs',
 });