Add mybinder badge in documentation when based on Jupyter Notebook (#218

)

- Updated `nbsphinx_prolog` in `conf.py` to include GitHub, Binder, and download options for each notebook.
- Enabled interactive version of notebooks on MyBinder.
- Updated the GitHub repository link in the `conf.py` file to ensure proper generation of interactive MyBinder links for all notebooks.
- Verified the syntax and placeholders to avoid URL generation errors.

docs/conf.py

@@ -148,7 +148,8 @@
 
 # -- Style nbsphinx notebook rendering ----------------------------------------
 
-nbsphinx_prolog = """
+nbsphinx_prolog = r"""
+{% set docname = 'docs/' + env.doc2path(env.docname, base=None)|string %}
 .. raw:: html
 
     <!-- nbsphinx prolog - start -->
@@ -184,7 +185,23 @@
 
     </style>
     
-    <!-- nbsphinx prolog - end -->
+    <div class="admonition note">
+    This page was generated from
+    <a class="reference external" href="https://github.com/1kastner/conflowgen/blob/main{{ env.config.release|e }}/{{ docname|e }}">{{ docname|e }}</a>.
+    Interactive online version:
+    <span style="white-space: nowrap;"><a href="https://mybinder.org/v2/gh/1kastner/conflowgen/main{{ env.config.release|e }}?filepath={{ docname|e }}"><img alt="Binder badge" src="https://mybinder.org/badge_logo.svg" style="vertical-align:text-bottom"></a>.</span>
+    <a href="{{ env.docname.split('/')|last|e + '.ipynb' }}" class="reference download internal" download>Download notebook</a>.
+    </div>
+
+.. only:: latex
+
+    .. raw:: latex
+
+        \nbsphinxstartnotebook{\scriptsize\noindent\strut
+        \textcolor{gray}{The following section was generated from
+        \sphinxcode{\sphinxupquote{\strut {{ docname | escape_latex }}}} \dotfill}}
+        
+        <!-- nbsphinx prolog - end -->
 """
 
 if os.environ.get("IS_RTD", False):