Standardize poet attributions and reformat blog template

Convert all poet attribution lines to use an em dash, English
name format, and consistent spacing. Re-indent the blog single
page template for readability and adjust the typewriter element
layout.

content/blog/python-async-guide.md

@@ -4,7 +4,7 @@ date: 2026-05-12T11:00:00+08:00
 draft: false
 poet: |
   They also serve who only stand and wait.
-  ——John Milton，英国，1608–1674
+  — John Milton, UK, 1608–1674
 description: "Understanding the event loop, writing proper async context managers, and avoiding the most common pitfalls with asyncio.gather and cancel scopes."
 tags:
   - Python