fix: use more internal linking

Author: BD103

content/blog/2023-08-06-ptr-metadata.md

@@ -11,7 +11,7 @@ outdate_alert = true
 
 # Rust Pointer Metadata
 
-Welcome back! In my [last blog post](https://bd103.github.io/blog/2023-06-27-global-allocators) I talked about overriding the global allocator. It was reasonably successful, even getting mentioned in [This Month in Rust OSDev](https://rust-osdev.com/this-month/2023-06/) without me suggesting it! That success has inspired me to write about another really interesting feature in the [Rust](https://www.rust-lang.org/) programming language called pointer metadata.
+Welcome back! In my [last blog post](@/blog/2023-06-27-global-allocators.md) I talked about overriding the global allocator. It was reasonably successful, even getting mentioned in [This Month in Rust OSDev](https://rust-osdev.com/this-month/2023-06/) without me suggesting it! That success has inspired me to write about another really interesting feature in the [Rust](https://www.rust-lang.org/) programming language called pointer metadata.
 
 {% caution(title = "Caution") %}
 Some examples in this blog post use the unstable feature [`ptr_metadata`](https://github.com/rust-lang/rust/issues/81513) with Nightly Rust. I have tested all of them with `rustc 1.72.0-nightly (101fa903b 2023-06-04)`, but it may fail to compile if you use a different version. For more information, please see [the Rustup documentation](https://rust-lang.github.io/rustup/concepts/channels.html#working-with-nightly-rust).