Broken past members links

[sankalpgambhir]

The links to pages of Evgenii Kotelnikov and Simon Robillard (both to Chalmers) are broken (404).

vprover.github.io/_includes/authors.html

Line 11 in c5fd562

{% assign kotelnikov = '<a href="http://www.cse.chalmers.se/~evgenyk/">Evgenii Kotelnikov</a>' %}

vprover.github.io/_includes/authors.html

Line 16 in c5fd562

{% assign robillard = '<a href="http://www.cse.chalmers.se/~simrob/">Simon Robillard</a>' %}