Link to 2018 conference is broken

[hancush]

I'm not sure of your PR policy, but the link to this year's conference breaks with nicar201x URL format tradition (me creys) and should be https://ire.org/conferences/nicar18/:

lightning-talks/templates/base.html

Line 113 in 0f97b92

<p><a href="https://ire.org/conferences/nicar2018/">https://ire.org/conferences/nicar2018/</a></p>