Add cut and examples to Sphinx docs (#231)

* Update index.rst

* Update observational.rst

* Update README.rst

README.rst

@@ -129,6 +129,10 @@ approximations that power much of the modern probabilistic machine learning land
   - Counterfactuals with normalizing flows
 - `Example: Structured Latent Confounders <https://basisresearch.github.io/chirho/slc.html>`_
   - Causal effect estimation when latent confounders are shared across groups
+- `Example: Synthetic difference-in-differences <https://basisresearch.github.io/chirho/sdid.html>`_
+  - Counterfactual estimation from longitudinal data
+- `Example: Robust estimation with the DR learner <https://basisresearch.github.io/chirho/dr_learner.html>`_
+  - Heterogeneous causal effect estimation with a misspecified model
 - `Design notes <https://basisresearch.github.io/chirho/design_notes>`_
   - Technical implementation details of ChiRho using effect handlers
 
@@ -184,4 +188,4 @@ Pearl, Judea. *Causality: Models, Reasoning and Inference*. 2nd ed. USA: Cambrid
 
 
 .. |Build Status| image:: https://github.com/BasisResearch/chirho/actions/workflows/test.yml/badge.svg
-   :target: https://github.com/BasisResearch/chirho/actions/workflows/test.yml
+   :target: https://github.com/BasisResearch/chirho/actions/workflows/test.yml

docs/source/index.rst

@@ -27,6 +27,8 @@ Table of Contents
    deepscm
    slc
    mediation
+   sdid
+   dr_learner
 
 .. toctree::
    :maxdepth: 2

docs/source/observational.rst

@@ -27,9 +27,13 @@ Handlers
    :members:
    :undoc-members:
 
+.. automodule:: chirho.observational.handlers.cut
+   :members:
+   :undoc-members:
+
 Internals
 ---------
 
 .. automodule:: chirho.observational.internals
    :members:
-   :undoc-members:
+   :undoc-members: