chore: delete test placeholder

content/posts/hello.md

@@ -1,16 +0,0 @@
-# Hello World
-
-2026-06-24
-
-This is the first post on the blog. It uses **markdown** rendered via goldmark.
-
-## Code blocks work too
-
-```go
-func main() {
-    println("controlled chaos")
-}
-```
-
-- Bullet lists
-- More bullets