Update DESIGN.md
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You can find details on the design and implementation of rqlite from [these blog posts](http://www.philipotoole.com/tag/rqlite/) (in particular [this post](https://www.philipotoole.com/replicating-sqlite-using-raft-consensus/) and [this post](https://www.philipotoole.com/rqlite-replicated-sqlite-with-new-raft-consensus-and-api/)).
## Design Presentations
-- [Presentation]( https://www.philipotoole.com/2021-rqlite-cmu-tech-talk) given to the [Carnegie Mellon Database Group](https://db.cs.cmu.edu/), [September 2021](https://db.cs.cmu.edu/events/vaccination-2021-rqlite-the-distributed-database-built-on-raft-and-sqlite-philip-otoole/).
+- [Presentation]( https://www.philipotoole.com/2021-rqlite-cmu-tech-talk) given to the [Carnegie Mellon Database Group](https://db.cs.cmu.edu/), [September 2021](https://db.cs.cmu.edu/events/vaccination-2021-rqlite-the-distributed-database-built-on-raft-and-sqlite-philip-otoole/). There is also a [video recording](https://www.youtube.com/watch?v=JLlIAWjvHxM) of the talk.
- [Presentation](https://docs.google.com/presentation/d/1lSNrZJUbAGD-ZsfD8B6_VPLVjq5zb7SlJMzDblq2yzU/edit?usp=sharing) given to the University of Pittsburgh, April 2018.
- [Presentation](http://www.slideshare.net/PhilipOToole/rqlite-replicating-sqlite-via-raft-consensu) given at the [GoSF](http://www.meetup.com/golangsf/) [April 2016](http://www.meetup.com/golangsf/events/230127735/) Meetup.
