Update external links

Author: bclozel

index.html

@@ -112,10 +112,10 @@
 
 ### External Links
 
-* Presentation from [Spring One 2GX 2013](https://speakerdeck.com/dsyer/spring-boot-introduction)
-* InfoQ article on [Micro Frameworks](https://www.infoq.com/articles/microframeworks1-spring-boot)
-* InfoQ news on [release of 1.0.0](https://www.infoq.com/news/2014/04/spring-boot-goes-ga)
-* Josh Long's vJUG [session on YouTube](https://www.youtube.com/watch?v=eCos5VTtZoI) from April 2014
+* [Spring Tips: Demystifying Bootiful Magic](https://spring.io/blog/2016/12/14/spring-tips-demystifying-bootiful-magic)
+* [It's a kind of magic: under the covers of Spring Boot](https://youtu.be/uof5h-j0IeE)
+* [Presentations on InfoQ](https://www.infoq.com/spring-boot/)
+* [Spring Boot for the web tier](https://youtu.be/7cemYpV1fNI)
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