removing africa engagement event from website (#208)

Author: AlexiaYiannouli

content/_index.md

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-{{< alert icon="bell" iconColor=#80539a  cardColor="#3ea3dc" textColor="#e4e4e3" >}}
-**Latest:** *Participate in the Research Software Quality Across Continents event on Tuesday 14th April! [Register here](https://indico.cern.ch/event/1636332/)*
-{{<  /alert >}}
-<br>
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 {{< alert icon="bell" iconColor="#ffffff" cardColor="#80539a" textColor="#e4e4e3" >}}
 **<span style="color: #ffffff;">Latest:</span>** *Register for our upcoming webinar: A Credit and Recognition Framework for RSEs and Trainers on Tuesday 28th April! [<span style="color: #e4e4e3;">Register here</span>](https://indico.cern.ch/event/1663496/)*
 {{< /alert >}}