docs: convert lua api docs to pure rst

Not all the docs are there yet, this is WIP

docs/rst/lua_api/lua_object_interest_api.rst

@@ -1,8 +1,24 @@
  .. _lua_object_interest_api:
 
-Lua Object Interest Documentation
----------------------------------
+Object Interest
+===============
 
-.. doxygenstruct:: ObjectInterest
-   :project: WirePlumber_Lua
-   :members:
+Constructors
+~~~~~~~~~~~~
+
+.. function:: Interest(decl)
+
+   :param table decl: an interest declaration
+   :returns: the interest
+   :rtype: ObjectInterest
+
+Methods
+~~~~~~~
+
+.. function:: Interest.matches(self, obj)
+
+   :param self: the interest
+   :param obj: an object to check for a match
+   :type obj: GObject or table
+   :returns: whether the object matches the interest
+   :rtype: boolean