Add v0.3.0 release blog post (#18)

* Add v0.3.0 release blog post
* Linkify Github user mentions and PRs
* Fix format issue
* Adjust layout
* Update content based on latest edits

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Signed-off-by: Jiaxin Shan <[email protected]>

Author: Jeffwan

content/posts/2025-05-21-v0.3.0-release.md

@@ -133,3 +133,7 @@ markup:
     # guessSyntax: true
     # lineNos: true
     # style: monokai
+  # enable original html markups
+  goldmark:
+    renderer:
+      unsafe: true