Documentation fixes (#455)

* Update README.md

Added "Try on EBRAINS" button

* Updated README.md file

* Updated doc frontpag

* Updated version file

* Lint issue

LFPy/version.py

@@ -1 +1 @@
-version = "2.3.1.dev0"
+version = "2.3.1"

README.md

@@ -17,6 +17,13 @@ Usage
 -----
 A brief video tutorial on LFPy is available here: <https://youtu.be/gCQkyTHZ1lw>
 
+LFPy is preinstalled at the EBRAINS collaboratory, and you can test LFPy online without installation, by clicking this button:
+
+[![](https://nest-simulator.org/TryItOnEBRAINS.png)](https://lab.ebrains.eu/hub/user-redirect/git-pull?repo=https%3A%2F%2Fgithub.com%2FLFPy%2Ftutorial_at_EBRAINS&urlpath=tree%2Ftutorial_at_EBRAINS%2F&branch=main)
+
+Note that you might need to be logged into an EBRAINS account for the link to work.
+To get a free EBRAINS account, sign up here: https://www.ebrains.eu/page/sign-up
+
 A basic simulation of extracellular potentials of a multicompartment neuron model set up with LFPy:
 
     >>> # import modules
@@ -60,9 +67,6 @@ A basic simulation of extracellular potentials of a multicompartment neuron mode
     >>> axes[2].set_ylabel('z (µm)')
     >>> axes[2].set_xlabel('t (ms)')
 
-You can now test some LFPy examples online without installation:
-[![Binder](https://mybinder.org/badge_logo.svg)](https://mybinder.org/v2/gh/LFPy/LFPy_binder_examples/master)
-
 Code status
 -----------
 

doc/index.rst

@@ -8,7 +8,24 @@
 Welcome to LFPy's documentation!
 ================================
 
-(Looking for the old LFPy v1.* documentation? Follow `link <https://lfpy.github.io/v1.3>`_)
+A brief video tutorial on LFPy is available here:
+
+.. raw:: html
+
+   <iframe width="560" height="315" src="https://www.youtube.com/embed/gCQkyTHZ1lw" frameborder="0" allowfullscreen></iframe>
+
+
+======
+
+You can test LFPy online without installation, by clicking this button:
+
+.. figure:: https://nest-simulator.org/TryItOnEBRAINS.png
+   :target: https://lab.ebrains.eu/hub/user-redirect/git-pull?repo=https%3A%2F%2Fgithub.com%2FLFPy%2Ftutorial_at_EBRAINS&urlpath=tree%2Ftutorial_at_EBRAINS%2F&branch=main
+
+Note that you might need to be logged into an EBRAINS account for the link to work.
+To get a free EBRAINS account, sign up here: https://www.ebrains.eu/page/sign-up
+
+Go to LFPy's source code: https://github.com/LFPy/LFPy
 
 Contents
 ========