SEO: add Keep reading links between blog posts, plus manual and plugin links

blog/proof-of-life.html

@@ -341,6 +341,16 @@ footer .built{font-size:13px;color:var(--muted);margin-top:8px}
 <p>Bringing your delivery closer is free and silent. Pushing it away costs a transaction, because the only way to take back a promise you've already handed out is to move the coins it points to. Check Alive simply reminds you, from inside your own wallet, when it's time to decide.</p>
 <p>That is proof of life without surveillance. And it is, we think, one of the reasons a Bitcoin-native inheritance protocol was worth building in the first place.</p>
 
+<aside class="related">
+<h2>Keep reading</h2>
+<ul style="padding-left:22px">
+<li><a href="why-electrum-and-timelocks.html">Why We Built BAL as an Electrum Plugin — and Why Timelocks Remove the Need for Trust</a></li>
+<li><a href="the-quietest-day.html">The Quietest Day: What Really Happens When Your Bitcoin Inheritance Arrives</a></li>
+<li><a href="should-you-tell-your-family-about-your-bitcoin.html">Should You Tell Your Family About Your Bitcoin? What They Need to Know, and What They Don't</a></li>
+</ul>
+<p>New to Bitcoin After Life? Read the <a href="https://bitcoin-after.life/docs/">user manual</a> or <a href="../index.html#plugin">get the Electrum plugin</a>.</p>
+</aside>
+
 <hr>
 <p class="disclaimer">Want the details? The manual covers <a href="https://bitcoin-after.life/docs/user-guide/check-alive.html" target="_blank" rel="noopener">Check Alive</a> and <a href="https://bitcoin-after.life/docs/user-guide/updating.html" target="_blank" rel="noopener">postponing vs anticipating</a>. <span translate="no">Bitcoin After Life</span> is open source and Bitcoin-only: explore the plugin and the server on <a href="https://bitcoin-after.life/gitea/bitcoinafterlife" target="_blank" rel="noopener">Gitea</a>.</p>
 </article>