point tkwant link to new official repository

content/extensions/index.rst

@@ -28,7 +28,7 @@ Kwant systems constructed from such tilings.
 
 Time-dependent transport
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-**Get the code**: https://gitlab.kwant-project.org/jbweston/tkwant
+**Get the code**: https://gitlab.kwant-project.org/kwant/tkwant
 
 A package for defining time-dependent systems with Kwant, and calculating
 time-dependent quantities. Details of the algorithm can be found in the