Add biography for Simon Pearce (#160)

* Add biography
* Remove the Twitter icon

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Signed-of-by: Simon Pearce <simon.pearce@cruk.manchester.ac.uk>
Co-authored-by: Marcel Ribeiro-Dantas <marcel.ribeirodantas@seqera.io>

content/our_ambassadors.html

@@ -734,13 +734,12 @@ <h4>Simon Pearce</h4>
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-                  Simon Pearce...
+                  Simon Pearce is a Principal Bioinformatician at the <a href="https://www.cruk.manchester.ac.uk/Our-Research/Cancer-Biomarker-Centre/CEP-Home/">Cancer Research UK National Biomarker Centre</a>, where he works on detecting and subtyping cancer using circulating cell-free DNA methylation.
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                   <img src="https://flagicons.lipis.dev/flags/4x3/gb.svg" class="ambassador" width=15 length=15 />
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                   <a href="https://github.com/SPPearce" target="_blank"><i class="fa fa-github fa-lg"></i></a>
                   <a href="https://linkedin.com/in/simonppearce" target="_blank"><i class="fa fa-linkedin fa-lg"></i></a>
-                  <a href="#" target="_blank"><i class="fa fa-twitter fa-lg"></i></a>
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