Migrate more documentation to the official Sphinx docs and mention IfcOpenShell-WASM as an installation option

src/ifcopenshell-python/docs/bsdd.rst

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+bSDD
+====
+
+The **buildingSMART Data Dictionary** (bSDD) is an online RESTful centralised
+API provided by buildingSMART that allows you to search for standardised
+classifications and properties.
+
+For example, if you want to assign a Uniclass classification system (popular in
+the UK) or an Omniclass classification system (popular in the US) to elements
+in your model, instead of downloading the classification system from their
+website, you can directly search the bSDD. This ensures that you are always up
+to date, and that codes are entered correctly (without spelling mistakes,
+correct formatting, etc).
+
+The bSDD search results may also be filtered based on IFC class. This will make
+it quick to shortlist relevant classification codes and properties to a
+particular object.
+
+The bSDD also stores information on whether or not classification systems
+require additional standard properties to be filled out, and whether they
+should be filled out in a particular way. For example, all countries need to
+fill out a "Fire Rating" property for walls, but they have different ways to
+fill it out. Local governments (or companies) may submit their standard to the
+bSDD so that all bSDD-compatible BIM applications can look up the property and
+fill it out in a standardised way (such as picking for a list of preset
+possible values defined by the local government).
+
+More reading:
+
+1. `Swagger API docs <https://bs-dd-api-prototype.azurewebsites.net/swagger/index.html>`_
+2. `bSDD Github Repository <https://github.com/buildingSMART/bSDD>`_
+
+Examples
+--------
+
+Learning how to use the bSDD is best done by reading the official Swagger API docs.
+
+.. code-block:: python
+
+    client = Client()
+
+    # Get a list of "dictionary domains". For example, Uniclass (by the NBS organisation) might be one domain.
+    print(client.Domain())
+
+    # For example, search the Netherland's Nlsfb2005 classification standard for all codes that apply to an IfcWall.
+    print(client.SearchListOpen("http://identifier.buildingsmart.org/uri/nlsfb/nlsfb2005-2.2", RelatedIfcEntity="IfcWall"))
+
+    # Alternatively, search up a particular classification code.
+    data = client.Classification("http://identifier.buildingsmart.org/uri/nlsfb/nlsfb2005-2.2/class/21.21")
+    print(data)
+
+    # You may also apply default properties (if the classification system on
+    # the bSDD defines them) to your IFC element. For example, if a
+    # classification code is for a load bearing wall, it can automatically set
+    # the "LoadBearing" property to True for you.
+    apply_ifc_classification_properties(ifc_file, element, data["classificationProperties"])