readthedocs fixes to topology inheritance diagram, add mixin classes …

…to `topology/__init__.py`, delete docs/requirements.txt, streamline workflows

.github/actions/setup/action.yml

@@ -14,5 +14,4 @@ runs:
     - name: Install Requirements
       shell: bash
       run: |
-        pip install wheel mypy pytest pytest-cov pylint 
-        pip install .
+        pip install .[development]

docs/direct_api_reference.rst

@@ -1,3 +1,4 @@
+
 ####################
 Direct API Reference
 ####################
@@ -52,7 +53,7 @@ supplementary functionality specific to 1D
 `~topology.Solid`) objects respectively.
 Note that a :class:`~topology.Compound` may be contain only 1D, 2D (:class:`~topology.Face`)  or 3D objects.
 
-.. inheritance-diagram:: topology
+.. inheritance-diagram:: topology.shape_core topology.zero_d topology.one_d topology.two_d topology.three_d topology.composite topology.utils
    :parts: 1
 
 .. py:module:: topology
@@ -63,6 +64,7 @@ Note that a :class:`~topology.Compound` may be contain only 1D, 2D (:class:`~top
    :special-members: __neg__
 .. autoclass:: Mixin1D
    :special-members: __matmul__, __mod__
+.. autoclass:: Mixin2D
 .. autoclass:: Mixin3D
 .. autoclass:: Shape
    :special-members: __add__, __sub__, __and__, __rmul__, __eq__, __copy__, __deepcopy__, __hash__

src/build123d/topology/__init__.py

@@ -51,9 +51,9 @@
     find_max_dimension,
 )
 from .zero_d import Vertex, topo_explore_common_vertex
-from .one_d import Edge, Wire, edges_to_wires, topo_explore_connected_edges
-from .two_d import Face, Shell, sort_wires_by_build_order
-from .three_d import Solid
+from .one_d import Edge, Wire, Mixin1D, edges_to_wires, topo_explore_connected_edges
+from .two_d import Face, Shell, Mixin2D,sort_wires_by_build_order
+from .three_d import Solid, Mixin3D
 from .composite import Compound, Curve, Sketch, Part
 
 __all__ = [