Refactor sDockerfile and update installation instructions

- Modifies the Dockerfile to install the toolkit in editable mode with visualization dependencies, removing the requirements.txt file.
- Updates the tests/README.md to clarify installation steps for running tests, emphasizing the use of editable mode for development dependencies.
- Removes tests/requirements.txt as its contents are now integrated into the main installation process.

Author: aaronstevenwhite

Dockerfile

@@ -8,8 +8,7 @@ WORKDIR "${HOME}/decomp"
 COPY --chown=${NB_UID}:${NB_GID} . .
 
 # install the package and its dependencies
-RUN pip install --no-cache-dir -r requirements.txt && \
-    pip install --no-cache-dir -e . && \
+RUN pip install --no-cache-dir -e ".[viz]" && \
     # pre-build the UDS corpus to cache it in the image
     python -c "from decomp import UDSCorpus; UDSCorpus()"
 

requirements.txt

@@ -4,13 +4,14 @@ tests use the [`pytest` framework](https://docs.pytest.org/).
 
 # Installation
 
-To run the tests in this directory, ensure that both the toolkit and
-`pytest` are installed.
+To run the tests in this directory, install the toolkit with development dependencies:
 
 ```bash
-pip install --user pytest==6.0.* git+git://github.com/decompositional-semantics-initiative/decomp.git
+pip install -e ".[dev]"
 ```
 
+This will install the toolkit in editable mode along with all testing dependencies including pytest.
+
 # Running the test suite
 
 The entire test suite can be run from the root directory of the