Update some sync recording links to Vimeo (#957)

The home of sync recordings is moving.

docs/blog/posts/last-week-in-pony-032817.md

@@ -24,7 +24,7 @@ Version 0.11.4 has been released, with the full [release notes here](https://pon
 
 - [Hello Wallaroo!](http://engineering.sendence.com/2017/03/hello-wallaroo/) A brief introduction to Sendence's Wallaroo, written in Pony.
 
-- [Developer Sync Meeting](https://sync-recordings.ponylang.io/r/2017_03_22.m4a) This weeks developer sync meeting.
+- [Developer Sync Meeting](https://vimeo.com/manage/videos/915001289) This weeks developer sync meeting.
 
 ## RFCs
 

docs/blog/posts/last-week-in-pony-040417.md

@@ -38,7 +38,7 @@ There were several "point" releases last week. For a list of full releases see t
 
 - [Pony Play Pen!](http://pony-playpen.lietar.net/) Pony now has a live, browser-accessible sandbox.
 
-- [Developer Sync Meeting](https://sync-recordings.ponylang.io/r/2017_03_29.m4a) Audio from the March 29th Pony developer sync meeting.
+- [Developer Sync Meeting](https://vimeo.com/manage/videos/915001704) Audio from the March 29th Pony developer sync meeting.
 
 - [Acolyte](https://github.com/jtfmumm/acolyte) A procedurally generated RPG inspired by Rogue and written in Pony.
 

docs/blog/posts/last-week-in-pony-041117.md

@@ -39,7 +39,7 @@ Was recently added to the Ponylang website to help folks with learning reference
 
 ponylang.io was moved from being hosted on GitHub pages to being on Netlify: HTTPS access is now available. Unfortunately, as part of the move, we broke hosting of the standard library documentation. Once we sort out the DNS, it will be at [http://stdlib.ponylang.io](http://stdlib.ponylang.io) but until the DNS is sorted, `stdlib.netlify.com` will work.
 
-- [Audio from the April 5th Pony Developer Sync](https://sync-recordings.ponylang.io/r/2017_04_05.m4a) is available
+- [Audio from the April 5th Pony Developer Sync](https://vimeo.com/manage/videos/915002156) is available
 
 Interested in how Pony gets developed? What's going on? What the developers are up to? Check out audio from our weekly meeting. Btw, it open to the public!
 

docs/blog/posts/last-week-in-pony-041717.md

@@ -30,7 +30,7 @@ Got something you think should be featured? There's a GitHub issue for that! Add
 
 ## News and Blog Posts
 
-- Audio from the April 12th Pony developer's sync is available at [https://sync-recordings.ponylang.io/r/2017_04_12.m4a](https://sync-recordings.ponylang.io/r/2017_04_12.m4a). The call was devoted mostly to addressing older issues that had started to back up. If you'd like to get involved with Pony development, feel free to stop by. We meet [weekly](https://calendar.google.com/calendar?cid=NTlqY3J1NmY1MG1ycHFibTdlbTRpY2xua2tAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ).
+- Audio from the April 12th Pony developer's sync is available at [https://vimeo.com/manage/videos/915002467](https://vimeo.com/manage/videos/915002467). The call was devoted mostly to addressing older issues that had started to back up. If you'd like to get involved with Pony development, feel free to stop by. We meet [weekly](https://calendar.google.com/calendar?cid=NTlqY3J1NmY1MG1ycHFibTdlbTRpY2xua2tAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ).
 
 - Core team member [Sean T. Allen](https://twitter.com/seantallen) announced that he'll be giving two different Pony talks in the coming months. One at [PolyConf](https://polyconf.com) in July, the other at QCon New York in June.
 

docs/blog/posts/last-week-in-pony-042417.md

@@ -22,7 +22,7 @@ Got something you think should be featured? There's a GitHub issue for that! Add
 
 - [Pony-stable](https://github.com/ponylang/pony-stable), the little dependency manager that could, is now an official Ponylang project. There's been a lot of noise about creating a [Pony package manager](https://github.com/ponylang/ponyc/issues/247) but so far, nothing has popped up. One reason is that for folks working every day in Pony, stable has been sufficient. We're sure that might change but in the meantime, [stable is the choice we are moving forward with](https://pony.groups.io/g/dev/topic/package_manager/4654150?p=,,,20,0,0,0::recentpostdate%2Fsticky,,,20,2,0,4654150).
 - Dipin Hora opened a [PR](https://github.com/ponylang/ponyc/pull/1844) that starts us down the path towards supporting musl based operating systems. Once the change is merged, you should be able to compile and run Pony on Alpine Linux.
-- Audio from the April 19th Pony Development Sync meeting is available for [your listening pleasure](https://sync-recordings.ponylang.io/r/2017_04_19.m4a). Includes a discussion of the heavy burden of trying to maintain install packages for various operating systems and possible things we can do to ease the load.
+- Audio from the April 19th Pony Development Sync meeting is available for [your listening pleasure](https://vimeo.com/manage/videos/915002757). Includes a discussion of the heavy burden of trying to maintain install packages for various operating systems and possible things we can do to ease the load.
 
 ## RFCs
 

docs/blog/posts/last-week-in-pony-043017.md

@@ -23,7 +23,7 @@ It was a bit of a quiet week in terms of public activity but there's plenty brew
 ## Items of note
 
 - The Pony core team has started a conversation about no longer creating pre-built Linux binaries for each release. Full details are available in [an email](https://pony.groups.io/g/user/topic/we_re_considering_dropping/4993866?p=,,,20,0,0,0::recentpostdate%2Fsticky,,,20,2,0,4993866) that I sent to the mailing list.
-- Audio from the [Pony Development Sync for April 26](https://sync-recordings.ponylang.io/r/2017_04_26.m4a) is available for your listening pleasure. Lots of discussion of various type system implementation edge cases and issues.
+- Audio from the [Pony Development Sync for April 26](https://vimeo.com/manage/videos/915003011) is available for your listening pleasure. Lots of discussion of various type system implementation edge cases and issues.
 
 ## News