Replace all post_url with Hugo ref blocks

content/articles/2021-08-26-fiber7-x.md

@@ -12,7 +12,7 @@ a bit different back in 2016. There was a switch provided by Litecom in which
 ports were resold OEM to upstream ISPs, and Litecom would provide the L2
 backhaul to a central place to hand off the customers to the ISPs, in my case
 Easyzone. In Oct'16, Fredy asked me if I could do a test of
-Fiber7-on-Litecom, which I did and reported on in a [blog post]({% post_url 2016-10-07-fiber7-litexchange %}).
+Fiber7-on-Litecom, which I did and reported on in a [blog post]({{< ref "2016-10-07-fiber7-litexchange" >}}).
 
 Some time early 2017, Init7 deployed a POP in Dietlikon (790BRE) and then
 magically another one in Br&uuml;ttisellen (1790BRE). It's a funny story
@@ -78,7 +78,7 @@ and aggregation switches are C9500-32C which take 32x QSFP+ (40/100Gbit).
 As a subscriber, we all got a courtesy headsup on the date of 1790BRE's upgrade.
 It was [scheduled](https://as13030.net/status/?ticket=4238550) for Thursday Aug 26th
 starting at midnight. As I've written about before (for example at the bottom of my
-[Bucketlist post]({% post_url 2021-07-26-bucketlist %})), I really enjoy the immediate
+[Bucketlist post]({{< ref "2021-07-26-bucketlist" >}})), I really enjoy the immediate
 gratification of physical labor in a datacenter. Most of my projects at work are on the
 quarters-to-years timeframe, and being able to do a thing and see the result of that
 thing ~immmediately, is a huge boost for me.