Add Shamir's Secret Sharing notes, update templates

public/index.html

@@ -55,7 +55,16 @@
 
 
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-      <a href='/blog/kzg-batch-proof.html'><div class="row postThumb">
+      <a href='/blog/shamir-secret-sharing.html'><div class="row postThumb">
+        <h3>Lagrange Polynomial Interpolation and Shamir secret sharing</h3>
+
+<p>Overview of Langrange Polynomial interpolation and Shamir&rsquo;s secret sharing.</p>
+
+<p><em>2021-10-10</em></p>
+
+</div>
+
+</a><a href='/blog/kzg-batch-proof.html'><div class="row postThumb">
         <h3>Batch proof in KZG Commitments</h3>
 
 <p>The benefit of <em>batch proof</em> is that allows us to proof multiple points while the proof size remains constant to one $\mathbb{G}_1$ point.</p>
@@ -181,6 +190,22 @@
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