Add docs info to Building.md

Signed-off-by: Ben Howe <[email protected]>

Author: bmhowe23

Building.md

@@ -55,12 +55,11 @@ export PYTHONPATH=${CUDAQ_INSTALL_PREFIX}:${CUDAQX_INSTALL_PREFIX}
 export PATH="${CUDAQ_INSTALL_PREFIX}/bin:${CUDAQX_INSTALL_PREFIX}/bin:${PATH}"
 ctest
 # Run the python tests
-# The --ignore option is to bypass tests that require additional packages not contained in 
+# The --ignore option is to bypass tests that require additional packages not contained in
 # the standard docker container
 cd ..
 python3 -m pytest -v libs/qec/python/tests --ignore libs/qec/python/tests/test_tensor_network_decoder.py
 python3 -m pytest -v libs/solvers/python/tests --ignore libs/solvers/python/tests/test_gqe.py
-
 ```
 
 If you want to change which version of CUDA-Q that CUDA-QX is paired with, you
@@ -81,3 +80,14 @@ contributing to CUDA-QX, but it should be noted that while this environment
 will have many GPU-accelerated simulators installed in it, it won't contain the
 *highest* performing CUDA-Q simulators. See [this note](https://nvidia.github.io/cuda-quantum/latest/using/install/data_center_install.html)
 for more details.
+
+## Building CUDA-QX Documentation from Source
+
+If you want to build and render our documentation from source, you can do this
+with the same environment as above. In particular, after running `ninja install`,
+you can run `ninja docs`. This places the documentation into the
+`/workspaces/cudaqx/build/docs/build/` directory. From there, you can open
+the `index.html` file in your browser, or if you are using VSCode or Cursor, you
+can simply browse to the `index.html` file in the Explorer panel, right click on
+the file, and select "Open with Live Server", and that will open your browser
+with the main docs page loaded automatically.