Update index.md

Author: shainova

team/join/index.md

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 # Open positions
 
- - PhD position: [Urban Ecological Data Analysis and Modeling](https://ecomplab.com/team/join/positions/phd_mar25.html)
- - Undergrad position: [Prediction of bacterial antibiotic resistance](https://ecomplab.com/team/join/positions/undergrad_mar25.html)
+ - PhD/postdoc position: [Link prediction in ecological networks](https://ecomplab.com/team/join/positions/phd_postdoc_lp.html)
 
 ### We are looking for bright, quantitatively-oriented students and postdocs, who wish to take part in exciting research!