test image in docs

sphinx/examples.rst

@@ -115,3 +115,10 @@ This example can be explored using the JSON-LD playground:
    <div style="position: relative; padding-top: 56.25%; height: 0;">
    <iframe src="https://json-ld.org/playground/#startTab=tab-table&json-ld=%7B%22%40context%22%3A%22https%3A%2F%2Fraw.githubusercontent.com%2Femmo-repo%2Fdomain-electrochemistry%2Fmaster%2Fcontext.json%22%2C%22%40type%22%3A%5B%22Electrode%22%2C%22Foil%22%5D%2C%22hasActiveMaterial%22%3A%7B%22%40type%22%3A%22Zinc%22%7D%2C%22hasProperty%22%3A%5B%7B%22%40type%22%3A%5B%22SpecificCapacity%22%2C%22MeasuredProperty%22%5D%2C%22hasNumericalPart%22%3A%7B%22%40type%22%3A%22Real%22%2C%22hasNumericalValue%22%3A800%7D%2C%22hasMeasurementUnit%22%3A%22emmo%3AMilliAmpereHourPerGram%22%7D%2C%7B%22%40type%22%3A%5B%22Thickness%22%2C%22ConventionalProperty%22%5D%2C%22hasNumericalPart%22%3A%7B%22%40type%22%3A%22Real%22%2C%22hasNumericalValue%22%3A250%7D%2C%22hasMeasurementUnit%22%3A%22emmo%3AMicroMetre%22%7D%2C%7B%22%40type%22%3A%5B%22Diameter%22%2C%22MeasuredProperty%22%5D%2C%22hasNumericalPart%22%3A%7B%22%40type%22%3A%22Real%22%2C%22hasNumericalValue%22%3A2%7D%2C%22hasMeasurementUnit%22%3A%22emmo%3ACentiMetre%22%7D%2C%7B%22%40type%22%3A%5B%22Mass%22%2C%22MeasuredProperty%22%5D%2C%22hasNumericalPart%22%3A%7B%22%40type%22%3A%22Real%22%2C%22hasNumericalValue%22%3A2.5%7D%2C%22hasMeasurementUnit%22%3A%22emmo%3AGram%22%7D%5D%7D" style="position: absolute; top: 0; left: 0; width: 100%; height: 100%;" frameborder="0" allowfullscreen></iframe>
    </div>
+
+
+Electrochemical Cell
+--------------------
+
+
+.. image:: /img/ElectrochemicalCell.svg