fix dead links (#1909)

docs/htmltest.yml

@@ -18,6 +18,8 @@ IgnoreURLs:
   - https://supportcenter.checkpoint.com/ # started to fail, meh.
   - https://marketplace.visualstudio.com/*
   - https://gist.githubusercontent.com/hellt/abc/raw/def/linux.clab.yml # test link used in docs
+  - serverfault.com # returns 403
+  - askubuntu.com # returns 403
 IgnoreDirectoryMissingTrailingSlash: true
 IgnoreAltMissing: true
 IgnoreSSLVerify: true

docs/lab-examples/frr01.md

@@ -8,13 +8,14 @@
 | **Version information**[^2]   | `containerlab:0.13.0`, `frrouting/frr:v7.5.1`, `docker-ce:19.03.13`  |
 
 ## Description
+
 This lab example consists of three FRR routers connected in a ring topology. Each router has one PC connected to it.
 
 This is also an example of how to pre-configure lab nodes of `linux` kind in containerlab.
 
 To start this lab, run the [`run.sh`][run] script, which will run the containerlab deploy commands, and then configure the PC interfaces.
 
-The lab configuration is documented in detail at: https://www.brianlinkletter.com/2021/05/use-containerlab-to-emulate-open-source-routers/
+<!-- The lab configuration is documented in detail at: https://www.brianlinkletter.com/2021/05/use-containerlab-to-emulate-open-source-routers/ -->
 
 [topofile]: https://github.com/srl-labs/containerlab/tree/main/lab-examples/frr01/frr01.clab.yml
 [run]: https://github.com/srl-labs/containerlab/tree/main/lab-examples/frr01/run.sh

lab-examples/frr01/README.md

@@ -6,5 +6,4 @@ This is also an example of how to pre-configure lab nodes on "linux" node types
 
 To start this lab, run the *run.sh* script, which will run the containerlab deploy commands, and then configure the PC interfaces.
 
-The lab configuration is documented in detail at: https://www.brianlinkletter.com/2021/05/use-containerlab-to-emulate-open-source-routers/
-
+<!-- The lab configuration is documented in detail at: https://www.brianlinkletter.com/2021/05/use-containerlab-to-emulate-open-source-routers/ -->