Update images - broken links/outdated photos

[meltemozcan]

https://mmmlab.rbind.io/members.html

[marklhc]

@Nellie021231 You can find the link to the images here https://dornsife.usc.edu/psyc/quantitative-methods-graduate-students/ (right click --> copy image link), unless @winniewytse or @Gengrui-Zhang want to use new images. Thanks!