chore: change health variables diagram to .png to fix problems with font visualization

content/english/health-variables.md

@@ -11,7 +11,7 @@ tabs:
         id: "health_variables"
     title: "Hospital Universitario 12 de Octubre + Hospital Clínic de Barcelona efforts"
     content:
-      - text: '<div class="text-center"><img alt="Spanish clinical data diagram" src="/images/diagrams/diagram-h12o-isaric-rec-3.svg" class="img-fluid mb-4"></div>'
+      - text: '<div class="text-center"><img alt="Spanish clinical data diagram" src="/images/diagrams/diagram-h12o-isaric-rec-3.png" class="img-fluid mb-4"></div>'
       - text: "The ISARIC-WHO Case Report Forms (CRFs) are used to collect data on individuals presenting with suspected or confirmed COVID-19 diagnosis. This resource has made available a collection of standardised clinical data to support patient care and COVID-19 research worldwide."
       - text: 'Hospital Universitario 12 de Octubre efforts have made possible the collection of observational variables associated to COVID-19 cases from Electronical Health Records using a flexible methodology based on Detailed Clinical Models (see the <a href="https://www.sciencedirect.com/science/article/pii/S1532046421000265?via%3Dihub">full article</a>).'
       - text: 'The figure below associates observational variables between the ISARIC COVID-19 Core Case Record Form (February 2, 2021) (<a href="https://isaric.org/research/covid-19-clinical-research-resources/covid-19-crf/">resource</a>) and the Dual Model of Observations from Hospital Universitario 12 de Octubre data models.'