Update index.md

index.md

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 We serve the users of the <a href="https://z.cash/" target="_blank">Zcash</a> protocol and blockchain. The Foundation also supports other applications of <a href="https://zkp.science/" target="_blank">zero-knowledge cryptography</a>, as well as other approaches to private cryptocurrency.</p>
 
-{% include email-cta.html %}
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 <h2 class="center">Announcements and Updates</h2>
 <ul class="post-list">
 {% for post in site.posts limit:10 %}