docs: Assign classes to documentation elements
docs: Assign classes to documentation elements

In CSS the following class names are available:

* keyword     (keywords like "typedef", "struct")
* type        (types like "int", "void*")
* comment     (comments after members of enums or structs)
* directive   (preprocessor directives, #define)
* undisclosed (text saying that the API is not public)

Additionally, kill all of the left-over "programlisting" class
assignments. There are no CSS rules for them.

Signed-off-by: Claudio Bley <620c9bdd34d39ed7d11f660475ae3b725e767808@av-test.de>

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