[Bug] Correctly render relations visualisation in notebooks

[GabrielePicco]

Summary

Describe the bug
The relations visualisation should visualise correctly in the notebooks, but the render functions is displaying the HTML as string

To Reproduce
Steps to reproduce the behavior:

import spacy
from zshot import PipelineConfig, displacy
from zshot.linker import LinkerSMXM
from zshot.utils.data_models import Entity, Relation
from zshot.relation_extractor import RelationsExtractorZSRC

config = PipelineConfig(
 entities=[
    Entity(name="company", description="The name of a company"),
    Entity(name="location", description="A physical location"),
    Entity(name="chemical compound", description="Any of a large class of chemical compounds in which one or more \
           atoms of carbon are covalently linked to atoms of other elements, most commonly hydrogen, oxygen, or nitrogen")
 ], 
 relations=[
    Relation(name="acronym", description="Is the acronym of"),
    Relation(name="parent", description="Is the parent of someone")
 ], 
 linker=LinkerSMXM(),
 relations_extractor=RelationsExtractorZSRC(),
)
nlp = spacy.blank("en")
nlp.add_pipe("zshot", config=config, last=True)

text = "CH2O2 is a chemical compound similar to Acetamide used in International \
Business Machines Corporation (IBM) to create new materials that act like PAGs."
doc = nlp(text)

Expected behavior

Correctly render the HTML in the notebook