Move legacy pages and layouts to new base

_includes/legacy/sections/social-news-aggregator.html

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+<h1 id="obb" class="anchor"><a href="#social-news-aggregator"><i class="fas fa-link anchor-icon"></i></a> Social News Aggregators</h1>
+
+<div class="alert alert-warning" role="alert">
+  <strong>If you are currently using a online bulletin board like Reddit, you should pick an alternative here.</strong>
+</div>
+
+{% include cardv2.html
+title="Aether"
+image="/assets/img/svg/3rd-party/aether.svg"
+description='<a href="https://github.com/nehbit/aether/blob/master/LICENSE.md">Aether is a free and open-source</a> decentralized social news aggregator with a built-in voting system.'
+website="https://getaether.net/"
+privacy-policy="https://getaether.net/privacypolicy/"
+forum="https://forum.privacytools.io/t/discussion-aether/1256"
+github="https://github.com/nehbit/aether"
+windows="https://getaether.net/download/"
+mac="https://getaether.net/download/"
+linux="https://getaether.net/download/"
+%}
+
+{% include cardv2.html
+title="Tildes"
+image="/assets/img/svg/3rd-party/tildes.svg"
+description='Tildes is a web-based self-hostable online bulletin board. It is licensed under <a href="https://gitlab.com/tildes/tildes/blob/master/LICENSE">AGPLv3</a>.'
+website="https://tildes.net"
+privacy-policy="https://docs.tildes.net/policies/privacy-policy"
+forum="https://forum.privacytools.io/t/discussion-tildes/1257"
+gitlab="https://gitlab.com/tildes/tildes"
+web="https://tildes.net"
+%}
+
+{% include cardv2.html
+title="Raddle"
+image="/assets/img/png/3rd-party/raddle.png"
+description="Raddle is a public Postmill instance focused on privacy and anti-censorship."
+website="https://raddle.me"
+privacy-policy="https://raddle.me/wiki/privacy_policy"
+forum="https://forum.privacytools.io/t/discussion-raddle/1258"
+gitlab="https://gitlab.com/postmill/"
+web="https://raddle.me"
+%}
+
+<h3>Worth Mentioning</h3>
+
+<ul>
+  <li><a href="https://beta.akasha.world/">Akasha</a> - A decentralized online bulletin board using <a href="https://www.wikipedia.org/wiki/InterPlanetary_File_System">IPFS</a> and <a href="https://www.wikipedia.org/wiki/Ethereum">Ethereum</a>.</li>
+  <li><a href="https://dev.lemmy.ml/">Lemmy</a> - An <a href="https://github.com/dessalines/lemmy/blob/master/LICENSE">AGPL</a>-licensed self-hostable link aggregator intended to work in the <a href="https://www.wikipedia.org/wiki/Fediverse">Fediverse</a>.</li>
+  <li><a href="https://notabug.io/">notabug.io</a> - A <a href="https://github.com/notabugio/notabug/blob/master/LICENSE.md">free and open-source</a> P2P link aggregator with a strong resemblance to old.reddit.com (not to be confused with <a href="https://notabug.org/">NotABug.org</a>).</li>
+</ul>