add "try it on ebrains" button for elephant tutorials (NeuralEnsemble…

…#538)

* add "try it on ebrains" button for elephant tutorials

* replace try it on ebrains button image with a badge

* change indentation of badge

* modify description

* change text of shield to "launch ebrains" to be in line with the binder badge

* update documentation on tutorials, add section describing the difference between ebrains and binder

---------

Co-authored-by: Michael Denker <m.denker@fz-juelich.de>

doc/tutorials.rst

@@ -4,8 +4,15 @@ Tutorials
 
 These tutorials provide narrative explanations, sample code, and expected
 output for some of the neurophysiological analyses in Elephant. You can browse
-the tutorials or launch them in mybinder to change and interact with the code.
+the tutorials, launch them in mybinder or try them on ebrains to change and
+interact with the code.
 
+Launching a notebook on EBRAINS and Binder both provide a convenient way to
+run and interact with code. The main difference between the two is that
+changes made to a notebook launched on Binder are not saved, while
+changes made to a notebook launched on EBRAINS are persistent and bound to the
+user's EBRAINS account. This makes EBRAINS a great choice if you want to save
+your work and come back to it later.
 
 Introductory
 ------------
@@ -20,7 +27,8 @@ Introductory
 
   .. image:: https://mybinder.org/badge.svg
      :target: https://mybinder.org/v2/gh/NeuralEnsemble/elephant/master?filepath=doc/tutorials/statistics.ipynb
-
+  .. image:: https://img.shields.io/badge/launch-ebrains-brightgreen
+     :target: https://lab.ch.ebrains.eu/hub/user-redirect/git-pull?repo=https%3A%2F%2Fgithub.com%2FNeuralEnsemble%2Felephant&urlpath=lab%2Ftree%2Felephant%2Fdoc%2Ftutorials%2Fstatistics.ipynb&branch=master
 
 Advanced
 --------
@@ -36,6 +44,9 @@ Advanced
 
   .. image:: https://mybinder.org/badge.svg
      :target: https://mybinder.org/v2/gh/NeuralEnsemble/elephant/master?filepath=doc/tutorials/unitary_event_analysis.ipynb
+  ..
+      .. image:: https://img.shields.io/badge/launch-ebrains-brightgreen
+     :target: https://lab.ch.ebrains.eu/hub/user-redirect/git-pull?repo=https%3A%2F%2Fgithub.com%2FNeuralEnsemble%2Felephant&urlpath=lab%2Ftree%2Felephant%2Fdoc%2Ftutorials%2F+unitary_event_analysis.ipynb&branch=master
 
 * Gaussian Process Factor Analysis (GPFA).
 
@@ -46,27 +57,35 @@ Advanced
 
   .. image:: https://mybinder.org/badge.svg
      :target: https://mybinder.org/v2/gh/NeuralEnsemble/elephant/master?filepath=doc/tutorials/gpfa.ipynb
+  .. image:: https://img.shields.io/badge/launch-ebrains-brightgreen
+     :target: https://lab.ch.ebrains.eu/hub/user-redirect/git-pull?repo=https%3A%2F%2Fgithub.com%2FNeuralEnsemble%2Felephant&urlpath=lab%2Ftree%2Felephant%2Fdoc%2Ftutorials%2Fgpfa.ipynb&branch=master
 
 * Spike Pattern Detection and Evaluation (SPADE)
 
   :doc:`View the notebook <../tutorials/spade>` or run interactively:
 
   .. image:: https://mybinder.org/badge.svg
      :target: https://mybinder.org/v2/gh/NeuralEnsemble/elephant/master?filepath=doc/tutorials/spade.ipynb
+  .. image:: https://img.shields.io/badge/launch-ebrains-brightgreen
+     :target: https://lab.ch.ebrains.eu/hub/user-redirect/git-pull?repo=https%3A%2F%2Fgithub.com%2FNeuralEnsemble%2Felephant&urlpath=lab%2Ftree%2Felephant%2Fdoc%2Ftutorials%2Fspade.ipynb&branch=master
 
 * Analysis of Sequences of Synchronous EvenTs (ASSET)
 
   :doc:`View the notebook <../tutorials/asset>` or run interactively:
 
   .. image:: https://mybinder.org/badge.svg
      :target: https://mybinder.org/v2/gh/NeuralEnsemble/elephant/master?filepath=doc/tutorials/asset.ipynb
+  .. image:: https://img.shields.io/badge/launch-ebrains-brightgreen
+     :target: https://lab.ch.ebrains.eu/hub/user-redirect/git-pull?repo=https%3A%2F%2Fgithub.com%2FNeuralEnsemble%2Felephant&urlpath=lab%2Ftree%2Felephant%2Fdoc%2Ftutorials%2Fasset.ipynb&branch=master
 
 * Granger causality
 
   :doc:`View the notebook <../tutorials/granger_causality>` or run interactively:
 
   .. image:: https://mybinder.org/badge.svg
      :target: https://mybinder.org/v2/gh/NeuralEnsemble/elephant/master?filepath=doc/tutorials/granger_causality.ipynb
+  .. image:: https://img.shields.io/badge/launch-ebrains-brightgreen
+     :target: https://lab.ch.ebrains.eu/hub/user-redirect/git-pull?repo=https%3A%2F%2Fgithub.com%2FNeuralEnsemble%2Felephant&urlpath=lab%2Ftree%2Felephant%2Fdoc%2Ftutorials%2Fgranger_causality.ipynb+&branch=master
 
 
 Additional
@@ -81,6 +100,8 @@ Additional
 
   .. image:: https://mybinder.org/badge.svg
      :target: https://mybinder.org/v2/gh/NeuralEnsemble/elephant/master?filepath=doc/tutorials/parallel.ipynb
+  .. image:: https://img.shields.io/badge/launch-ebrains-brightgreen
+     :target: https://lab.ch.ebrains.eu/hub/user-redirect/git-pull?repo=https%3A%2F%2Fgithub.com%2FNeuralEnsemble%2Felephant&urlpath=lab%2Ftree%2Felephant%2Fdoc%2Ftutorials%2Fparallel.ipynb+&branch=master
 
 ..
     Index the notebooks in a hidden toctree to avoid sphinx warnings.