blog: v6.1 and security review announcement (#5040)

* blog: v6.1 and security review announcement

* update, images

* readme

* update review links on home page

* links to review

website/src/_includes/blog_previews/20241014.html

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+<p><strong>New security audit!</strong></p>
+
+<p class="mb-[12px]">Trail of Bits reviewed the cryptographic design of protocols used in SimpleX network and apps.
+</p>
+
+<p><strong>v6.1 is released:</strong></p>
+
+<ul>
+    <li>Better calls: switch audio and video during the call.</li>
+    <li>Better iOS notifications: improved delivery, reduced traffic usage.</li>
+    <li>Better user experience: switch chat profiles, customizable message shapes, forward up to 20 messages.</li>
+</ul>

website/src/_includes/overlay_content/hero/card_3.html

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 </p>
 <p>
     {{ "hero-overlay-card-3-p-3" | i18n({}, lang ) | safe }}
-</p>
+</p>