Do not link check external sites that return error

x.com links are returning HTTP 400 with the client this checker uses.

filezilla-project.org is returning HTTP 403

Also fix up support site link missed in
I45beb2edbb8311233833109667723ccc26c7be62, it was moved to a support
article so that it can be publicly available.

Change-Id: Id42460bfcb7b38ce1c5b84bd045fe8156d5560f1

Author: waipeng

Rakefile

@@ -14,6 +14,8 @@ CONFIG = {
 IGNORE_URLS = %w{
   localhost
   www.linkedin.com\/company\/australian-research-data-commons
+  x.com\/ARDC_AU
+  filezilla-project.org
 }.map{|h| "/#{h}/"}.join(",")
 
 

_migration/migrating-instance-legacy.md

@@ -19,7 +19,7 @@ Further contextual information can be found on the [Nectar Support site](https:/
 
 1. [Snapshot the instance]({{ site.baseurl }}/snapshots/01-overview).  You should verify that the snapshot has been successfully uploaded to the Image catalog.
 
-1. [Launch new instance]({{ site.baseurl }}/snapshots/04-launch-instance-from-snapshot) from snapshot in target Availability Zone. If you run into the [“No valid hosts found”](https://support.ehelp.edu.au/support/discussions/topics/6000060776) issue, you could try using a smaller flavor for the new instance, either temporarily (and resize later) or permanently. Alternatively raise a [support ticket](https://support.ehelp.edu.au).
+1. [Launch new instance]({{ site.baseurl }}/snapshots/04-launch-instance-from-snapshot) from snapshot in target Availability Zone. If you run into the [“No valid hosts found”](https://support.ehelp.edu.au/support/solutions/articles/6000279599) issue, you could try using a smaller flavor for the new instance, either temporarily (and resize later) or permanently. Alternatively raise a [support ticket](https://support.ehelp.edu.au).
 
 1. If you have decided that you need a volume to replace the ephemeral file system:
 
@@ -41,4 +41,4 @@ Further contextual information can be found on the [Nectar Support site](https:/
 
 1. Wait.  It is advisable to keep the old volume for a few days in case it is needed to roll back the migration.
 
-1. [Delete the old instance]({{ site.baseurl }}/changing-instances/05-deleting)
+1. [Delete the old instance]({{ site.baseurl }}/changing-instances/05-deleting)