Disable false positive link check failures

These are calendar URLs, so they don't work when checked as normal web
pages

calendar.md

@@ -4,7 +4,7 @@ author: "Graeme Stewart"
 layout: default
 ---
 
-The HSF [Community Calendar](https://calendar.google.com/calendar/embed?src=e4v33e1a1drbncdle1n03ahpcs%40group.calendar.google.com){:target="_hsf_calendar"}
+The HSF [Community Calendar](https://calendar.google.com/calendar/embed?src=e4v33e1a1drbncdle1n03ahpcs%40group.calendar.google.com){:target="_hsf_calendar"} <!-- markdown-link-check-disable-line -->
 can be edited by people in the following Google Groups:
 
 - [HSF Steering Group](https://groups.google.com/forum/#!forum/hsf-steering)
@@ -15,7 +15,7 @@ The most straight forward way to do this is to
 
 - go to your [Google Calendar page](https://calendar.google.com/calendar)
 - select *Other Calendars* -> *Add by URL*
-- add the [following URL](https://calendar.google.com/calendar/ical/e4v33e1a1drbncdle1n03ahpcs%40group.calendar.google.com/public/basic.ics)
+- add the [following URL](https://calendar.google.com/calendar/ical/e4v33e1a1drbncdle1n03ahpcs%40group.calendar.google.com/public/basic.ics) <!-- markdown-link-check-disable-line -->
 
 ```sh
 https://calendar.google.com/calendar/ical/e4v33e1a1drbncdle1n03ahpcs%40group.calendar.google.com/public/basic.ics