Replace all post_url with Hugo ref blocks

content/articles/2021-07-26-bucketlist.md

@@ -65,7 +65,7 @@ don't think any global downtime for my internet presence has ever occured.
 It's not a coincidence that even Google for the longest time used my website
 at [SixXS](https://sixxs.net/) for their own monitoring, now _that_ is
 cool. Although Jeroen and I did decide to retire the SixXS project (see my
-[Sunset]({% post_url 2017-03-01-sixxs-sunset %}) article on why), the website
+[Sunset]({{< ref "2017-03-01-sixxs-sunset" >}}) article on why), the website
 is still up and served off of three distinct networks, because I have to stay
 true to the SRE life.
 
@@ -129,11 +129,11 @@ So, in a really epic roadtrip full of nerd, Fred and I went into total geek-mode
 as we traveled to several European cities to deploy AS50869 on a european ring. I
 wrote about my experience extensively in these blog posts:
 
-*   [Frankfurt]({% post_url 2021-05-17-frankfurt %}): May 17th 2021.
-*   [Amsterdam]({% post_url 2021-05-26-amsterdam %}): May 26th 2021.
-*   [Lille]({% post_url 2021-05-28-lille %}): May 28th 2021.
-*   [Paris]({% post_url 2021-06-01-paris %}): June 1st 2021.
-*   [Geneva]({% post_url 2021-07-03-geneva %}): July 3rd 2021.
+*   [Frankfurt]({{< ref "2021-05-17-frankfurt" >}}): May 17th 2021.
+*   [Amsterdam]({{< ref "2021-05-26-amsterdam" >}}): May 26th 2021.
+*   [Lille]({{< ref "2021-05-28-lille" >}}): May 28th 2021.
+*   [Paris]({{< ref "2021-06-01-paris" >}}): June 1st 2021.
+*   [Geneva]({{< ref "2021-07-03-geneva" >}}): July 3rd 2021.
 
 I think we can now say that I'm _peering on the FLAP_. It's not that this AS50869
 carries that much traffic, but it's a very welcome relief of daily worklife to be