Fix syntax for image inclusion. Rescale image down to 500px wide.

Gemfile.lock

@@ -73,7 +73,7 @@ GEM
     namae (0.11.3)
     nokogiri (1.6.8.1)
       mini_portile2 (~> 2.1.0)
-    parallel (1.9.0)
+    parallel (1.10.0)
     pathutil (0.14.0)
       forwardable-extended (~> 2.6)
     pry (0.10.4)

_posts/2016-11-23-dagstuhl.md

@@ -5,4 +5,4 @@ Andrea Cerone was invited to attend the seminar on [Concurrency with Weak Memory
 The seminar covered a wide range of topics, including fundamental results in the theory underlying weak memory models, 
 applications in the fields of hardware architectures, compiler optimisations and transactional systems, 
 as well as static analysis techniques for the analysis of programs. Andrea Cerone gave a talk on ‘Analyzing Snapshot Isolation’
-[![Andrea-Cerone-at-Dagstuhl-with-former-colleague-Giovanni-Bernardi(https://gitlab.doc.ic.ac.uk/resource-reasoning/psvg.doc.ic.ac.uk/blob/master/images/posts/Dagstuhl-Seminar-16.png)]
\ No newline at end of file
+![Andrea Cerone at Dagstuhl with former colleague Giovanni Bernardi](/images/posts/Dagstuhl-Seminar-16.png)