Update examples for PROF instead of rdfp

[rob-metalinkage]

removed unused namespaces and updated 1 example to use PROF

the only lost information is this;

ex:DHT22_output
    # a              rdfp:GraphDescription ;

this is the equivalent

ex:DHT22_output
    # specify the encoding format - which is not necessary constrained by the model for the content
    dct:format     <https://w3id.org/mediatype/text/turtle> ;
    rdfs:comment   "The output is a RDF Graph that describes both the temperature and the humidity. It can be validated by a SHACL shapes graph."@en ;
    dct:conformsTo ex:myProfile
.