Fix some dead links in older posts

Author: phil-opp

content/this-month/2021-04/index.md

@@ -88,7 +88,7 @@ Thanks to [@Knapsac](https://github.com/KnapSac) and [@toothbrush7777777](https:
 
 ### [`ovmf-prebuilt`](https://github.com/rust-osdev/ovmf-prebuilt)
 
-In order to make it easier to run UEFI disk images in [QEMU](https://www.qemu.org/) using [OVMF](https://github.com/tianocore/tianocore.github.io/wiki/OVMF), we created a new `ovmf-prebuilt` project this month. The projects automatically downloads the latest prebuilt OVMF RPM images from [Gerd Hoffman's firmware repository](https://www.kraxel.org/repos/) and publishes the extracted `OVMF_*.fd` files as [GitHub releases](https://github.com/rust-osdev/ovmf-prebuilt/releases). A new release is created daily through a CI script. Note that the licensing terms of the [`tianocore/edk2`](https://github.com/tianocore/edk2) repository apply to the released files.
+In order to make it easier to run UEFI disk images in [QEMU](https://www.qemu.org/) using [OVMF](https://github.com/tianocore/tianocore.github.io/wiki/OVMF), we created a new `ovmf-prebuilt` project this month. The projects automatically downloads the latest prebuilt OVMF RPM images from [Gerd Hoffman's firmware repository](https://web.archive.org/web/20250505152052/https://www.kraxel.org/repos/) and publishes the extracted `OVMF_*.fd` files as [GitHub releases](https://github.com/rust-osdev/ovmf-prebuilt/releases). A new release is created daily through a CI script. Note that the licensing terms of the [`tianocore/edk2`](https://github.com/tianocore/edk2) repository apply to the released files.
 
 ### [`uart_16550`](https://github.com/rust-osdev/uart_16550)
 

content/this-month/2023-06/index.md

@@ -27,7 +27,7 @@ Here we collect news, blog posts, etc. related to OS development in Rust.
 
 - [Redox OS elects its first Board of Directors](https://www.redox-os.org/news/board-meeting-2023-06-21/)
 - [Frida 16.1.0 Released](https://frida.re/news/2023/06/23/frida-16-1-0-released/)
-- [Intercepting Allocations with the Global Allocator](https://bd103.github.io/blog/2023-06-27-global-allocators/)
+- [Intercepting Allocations with the Global Allocator](https://web.archive.org/web/20250513072029/https://bd103.github.io/blog/2023-06-27-global-allocators/)
 - [Building an out-of-tree Rust Kernel Module Part Three](https://blog.rnstlr.ch/building-an-out-of-tree-rust-kernel-module-part-three.html)
 - Discussion: [How hard would it be to port the Rust toolchain to a new non-POSIX OS written in Rust and get it to host its own development?](https://www.reddit.com/r/rust/comments/14qvu98/how_hard_would_it_be_to_port_the_rust_toolchain/)
 - Discussion: [Will there be fewer jailbreaks in the future if operating systems like iOS start adopting rust?](https://www.reddit.com/r/rust/comments/14k49ho/will_there_be_fewer_jailbreaks_in_the_future_if/)