unlink dead Google Plus links

Author: SethTisue

_posts/2015-07-26-sip-slip-summary-july-2015.md

@@ -9,7 +9,7 @@ title: SIP/SLIP Summary, July 27th 2015
 
 ### Next Committee Meeting:
 
-Thursday August 13th, 4.30pm GMT. [Google Hangout Event](https://plus.google.com/u/1/events/cfh933nkhhq0pe7h23c9v4csk6o)
+Thursday August 13th, 4.30pm GMT. Google Hangout Event (dead link: httpx://plus.google.com/u/1/events/cfh933nkhhq0pe7h23c9v4csk6o)
 
 [Video of last meeting](https://www.youtube.com/watch?v=ndkT5qHZHI0)
 

_posts/2015-08-25-minutes-from-aug-2015.md

@@ -8,7 +8,7 @@ title: Minutes from Aug SIP/SLIP Meeting
 ## SIP/SLIP Meeting, Aug 20th 2015
 
 ### Video of Aug Meeting
-[Video of Aug meeting](https://plus.google.com/u/5/events/cfh933nkhhq0pe7h23c9v4csk6o)
+Video of Aug meeting (dead link: httpx://plus.google.com/u/5/events/cfh933nkhhq0pe7h23c9v4csk6o)
 
 ## Opening Matters
 This is a short post, it has been superseded by the September minutes but is included here for completeness. What follows is just a brief outline of what was covered, for the full record, please see the video above.

_posts/2015-10-07-minutes-from-sept-2015.md

@@ -9,10 +9,10 @@ title: Minutes from Sept SIP/SLIP Meeting
 
 #### Next Committee Meeting:
 
-Monday Oct 12th, 4.30pm GMT. [Google Hangout Event](https://plus.google.com/u/5/events/ci1hc0tn9jf0v45a9qdd7a520j8)
+Monday Oct 12th, 4.30pm GMT. Google Hangout Event (dead link: httpx://plus.google.com/u/5/events/ci1hc0tn9jf0v45a9qdd7a520j8)
 
 #### Video of Sept Meeting
-[Video of last meeting](https://plus.google.com/u/5/events/cvv4in7eq5tf4rus2ve0jodvo5c)
+Video of last meeting (dead link: httpx://plus.google.com/u/5/events/cvv4in7eq5tf4rus2ve0jodvo5c)
 
 ## Opening Matters