fix binder links and badge in doc releases
@@ -120,7 +120,7 @@ def parse_notebooks(folder, url_docs):
**This is a fixed-text formatted version of a Jupyter notebook**
-- Try online [![Binder](https://mybinder.org/badge.svg)](https://mybinder.org/v2/gh/gammapy/gammapy-webpage/{release_number_binder}?urlpath=lab/tree/{nb_filename})
+- Try online [![Binder](https://static.mybinder.org/badge.svg)](https://mybinder.org/v2/gh/gammapy/gammapy-webpage/v{release_number_binder}?urlpath=lab/tree/{nb_filename})
- You can contribute with your own notebooks in this
[GitHub repository](https://github.com/gammapy/gammapy/tree/master/tutorials).
- **Source files:**
