Update readme

Author: kabilar

README.md

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 # DataJoint Element - ZStack
 
 DataJoint Element for z-stack (volumetric) imaging, features cell segmentation with 
-[cellpose](https://github.com/MouseLand/cellpose){:target="_blank"}, data upload to 
-[BossDB](https://bossdb.org/){:target="_blank"}, and data visualization with 
-[Neuroglancer](https://github.com/google/neuroglancer){:target="_blank"}. DataJoint Elements collectively standardize and automate data collection and analysis for neuroscience experiments. Each Element is a modular pipeline for data storage and processing with corresponding database tables that can be combined with other Elements to assemble a fully functional pipeline.
+[cellpose](https://github.com/MouseLand/cellpose), data upload to 
+[BossDB](https://bossdb.org/), and data visualization with 
+[Neuroglancer](https://github.com/google/neuroglancer). DataJoint Elements collectively standardize and automate data collection and analysis for neuroscience experiments. Each Element is a modular pipeline for data storage and processing with corresponding database tables that can be combined with other Elements to assemble a fully functional pipeline.
 
 ## Experiment Flowchart