docs: adjust to pip installation, add code index

docs/source/templates/code.rst

@@ -0,0 +1,36 @@
+{% set reduced_name = fullname.split(".", 1)[-1] if fullname.startswith("kupferbootstrap.") else fullname %}
+
+{{ fullname | escape | underline }}
+
+.. rubric:: Description
+
+.. automodule:: {{ fullname }}
+   :members:
+   :undoc-members:
+
+.. currentmodule:: {{ fullname }}
+
+
+
+
+{% if classes %}
+.. rubric:: Classes
+
+.. autosummary::
+    :toctree: .
+    {% for class in classes %}
+    {{ class }}
+    {% endfor %}
+
+{% endif %}
+
+{% if functions %}
+.. rubric:: Functions
+
+.. autosummary::
+    :toctree: .
+    {% for function in functions %}
+    {{ function }}
+    {% endfor %}
+
+{% endif %}