add citation to welcome popup

Author: PaulScotti

index.html

@@ -2713,7 +2713,7 @@
 }
 // open pop-up:
 modalClosed = false;
-document.getElementById("openModal_text").innerHTML = 'Welcome to <i>EduCortex</i>!<br><br>Click anywhere on the brain to see terms associated with the clicked region. Or do the reverse: type and search any term to see what areas of the brain are associated with the term.<br><br>For more info: https://github.com/PaulScotti/educortex';
+document.getElementById("openModal_text").innerHTML = 'Welcome to <i>EduCortex</i>!<br><br>Click anywhere on the brain to see terms associated with the clicked region. Or do the reverse: type and search any term to see what areas of the brain are associated with the term.<br><br>For more info: https://github.com/PaulScotti/educortex<br><br>Citation: Scotti, P. S., Kulkarni, A., Mazor, M., Klapwijk, E., Yarkoni, T., Huth, A. G. (2020). EduCortex: browser-based 3D brain visualization of fMRI meta-analysis maps. Journal of Open Source Education.';
 window.location.href = '#openModal';
 checkFlag1();
 function checkFlag1() {