Switch blog.json from embedded content to content_url links

Changes blog.json generation to link to hosted markdown files instead of
embedding full content. Each post now includes a content_url field pointing
to {site_url}/{slug}/index.md. This significantly reduces blog.json file
size while maintaining full content access via standard HTTP requests.

Updated README.rst to document the new linking behavior & how blog.json works.

README.rst

@@ -67,7 +67,7 @@ The blog automatically generates multiple formats optimized for AI agents & LLM
 
 **Generated files:**
 
-- ``/blog.json`` - Entire blog in single JSON file (jsonblog.dev format)
+- ``/blog.json`` - Blog index with links to markdown files (jsonblog.dev format)
 - ``/feeds/all.json`` - JSON Feed v1.1 alternative to Atom/RSS
 - ``/llms.txt`` - AI agent onboarding documentation with API info
 - ``/*/index.md`` - GitHub-flavored Markdown for every post
@@ -77,11 +77,15 @@ The blog automatically generates multiple formats optimized for AI agents & LLM
 
 These formats enable AI agents, LLMs, & automated systems to:
 
-- Ingest entire blog content in one request (blog.json)
+- Discover all posts & fetch markdown via ``content_url`` links (blog.json)
 - Subscribe to updates via JSON instead of XML (feeds/all.json)
 - Discover blog structure & available formats (llms.txt)
 - Read posts without HTML parsing (index.txt, index.md)
 
+**How blog.json works:**
+
+The ``blog.json`` file uses the jsonblog.dev format & links to hosted markdown files instead of embedding content. Each post includes a ``content_url`` field pointing to ``https://russell.ballestrini.net/{slug}/index.md``. This keeps the JSON file lightweight while providing full access to all post content through standard HTTP requests.
+
 All formats are automatically generated during CI/CD builds & kept in sync with the HTML content.
 
 **Requirements:**

lib/generate_jsonblog.py

@@ -1,7 +1,7 @@
 #!/usr/bin/env python3
 """
 Generate JSON Blog (jsonblog.dev) format - single JSON file with all posts.
-Uses Markdown content from index.md files generated by rst2md.py.
+Links to Markdown files (index.md) generated by rst2md.py instead of embedding content.
 """
 
 import json
@@ -109,20 +109,8 @@ def parse_atom_feed(atom_path):
     return feed_info, entries
 
 
-def load_markdown_content(output_dir, slug):
-    """Load markdown content from index.md file."""
-    md_path = output_dir / slug / 'index.md'
-    if md_path.exists():
-        try:
-            return md_path.read_text(encoding='utf-8')
-        except Exception as e:
-            print(f"Warning: Could not read {md_path}: {e}")
-            return None
-    return None
-
-
 def generate_jsonblog(atom_path, output_dir, site_url):
-    """Generate JSON Blog format with Markdown content."""
+    """Generate JSON Blog format with links to Markdown content."""
     feed_info, entries = parse_atom_feed(atom_path)
 
     jsonblog = {
@@ -146,15 +134,12 @@ def generate_jsonblog(atom_path, output_dir, site_url):
             'createdAt': entry['createdAt'],
         }
 
-        # Try to load markdown content
-        md_content = load_markdown_content(output_dir, entry['slug'])
-        if md_content:
-            post['content'] = md_content
+        # Check if markdown file exists, then link to it
+        md_path = output_dir / entry['slug'] / 'index.md'
+        if md_path.exists():
+            post['content_url'] = f"{site_url}/{entry['slug']}/index.md"
             post['content_type'] = 'markdown'
             markdown_found += 1
-        else:
-            # Fallback to plain text from HTML
-            post['content'] = entry['content']
 
         if entry['updatedAt'] and entry['updatedAt'] != entry['createdAt']:
             post['updatedAt'] = entry['updatedAt']
@@ -170,7 +155,7 @@ def generate_jsonblog(atom_path, output_dir, site_url):
 
         jsonblog['posts'].append(post)
 
-    print(f"Generated {len(jsonblog['posts'])} posts ({markdown_found} with markdown content)")
+    print(f"Generated {len(jsonblog['posts'])} posts ({markdown_found} with markdown links)")
     return jsonblog