Replace all post_url with Hugo ref blocks

content/articles/2021-08-07-fs-switch.md

@@ -216,7 +216,7 @@ For my loadtests, I used Cisco's T-Rex ([ref](https://trex-tgn.cisco.com/)) in s
 with a custom Python controller that ramps up and down traffic from the loadtester to the device
 under test (DUT) by sending traffic out `port0` to the DUT, and expecting that traffic to be
 presented back out from the DUT to its `port1`, and vice versa (out from `port1` -> DUT -> back
-in on `port0`). You can read a bit more about my setup in my [Loadtesting at Coloclue]({% post_url 2021-02-27-coloclue-loadtest %})
+in on `port0`). You can read a bit more about my setup in my [Loadtesting at Coloclue]({{< ref "2021-02-27-coloclue-loadtest" >}})
 post.
 
 To stress test the switch, several pairs at 10G and 25G were used, and since the specs boast