Migrate to Bootstrap 5

_includes/legacy/sections/instant-messenger.html

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-<h1 id="im" class="anchor">
+<h2 id="im" class="anchor">
   <a href="#im"><i class="fas fa-link anchor-icon"></i></a>
   Encrypted Instant Messengers
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+</h2>
 
 <div class="alert alert-warning" role="alert">
   <strong>If you are currently using an Instant Messenger like Telegram, LINE, Viber, <a href="https://www.eff.org/deeplinks/2016/10/where-whatsapp-went-wrong-effs-four-biggest-security-concerns">WhatsApp</a>, or plain SMS, you should pick an alternative here.</strong>
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 <p>We have described the three main types of messaging programs that exist: Centralized, Federated and Peer-to-Peer (P2P), with the advantages and disadvantages of each.</p>
 
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   Centralized
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 <p>Centralized messengers are those where every participant is on the same server or network of servers controlled by the same organization.</p>
 
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 <div class="container">
   <div class="row">
     <div class="col-md-6">
-      <h3>Advantages</h3>
+      <h4>Advantages</h4>
       <ul>
         <li>New features and changes can be implemented more quickly.</li>
         <li>Easier to get started with and to find contacts.</li>
       </ul>
     </div>
     <div class="col-md-6">
-      <h3>Disadvantages</h3>
+      <h4>Disadvantages</h4>
       <ul>
         <li>Centralized services could be more susceptible to <a href="#exploiting-centralized-networks">legislation requiring backdoor access</a>.</li>
         <li>Can include <a href="https://drewdevault.com/2018/08/08/Signal.html">restricted control or access</a>. This can include things like:</li>
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 </div>
 
 
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   Federated
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 <p>Federated messengers use multiple, independent servers that are able to talk to each other (email is one example of a federated service). Federation allows system administrators to control their own server and still be a part of the larger communications network.</p>
 
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 <div class="container">
   <div class="row">
     <div class="col-md-6">
-      <h3>Advantages</h3>
+      <h4>Advantages</h4>
       <ul>
         <li>Allows for greater control over your own data when running your own server.</li>
         <li>Allows you to choose who to trust your data with by choosing between multiple "public" servers.</li>
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       </ul>
     </div>
     <div class="col-md-6">
-      <h3>Disadvantages</h3>
+      <h4>Disadvantages</h4>
       <ul>
         <li>Adding new features is more complex, because these features need to be standardized and tested to ensure they work with all servers on the network.</li>
         <li>Some metadata may be available (e.g., information like "who is talking to whom," but not actual message content if E2EE is used).</li>
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   <li><a href="https://status.im">Status.im</a> - Encrypted instant messenger with an integrated <a href="https://en.wikipedia.org/wiki/Ethereum">Ethereum</a> wallet (cryptocurrency) that also includes support for <a href="https://our.status.im/tag/dapps">DApps (decentralized apps)</a> (web apps in a curated store). Uses the <a href="https://our.status.im/status-launches-private-peer-to-peer-messaging-protocol/">Waku protocol (a fork of Whisper)</a> for P2P communication. Only available for iOS and Android.</li>
 </ul>
 
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   Peer to Peer (P2P)
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+</h3>
 
 <p>Peer-to-Peer instant messengers connect directly to each other without requiring third-party servers. Clients (peers) usually find each other through the use of a <a href="https://en.wikipedia.org/wiki/Distributed_computing">distributed computing</a> network. Examples of this include <a href="https://en.wikipedia.org/wiki/Distributed_hash_table">DHT (distributed hash table)</a> (used with technologies like <a href="https://en.wikipedia.org/wiki/BitTorrent_(protocol)">torrents</a> and <a href="https://en.wikipedia.org/wiki/InterPlanetary_File_System">IPFS</a>, for example). Another approach is proximity based networks, where a connection is established over WiFi or Bluetooth (for example, Briar or the <a href="https://www.scuttlebutt.nz">Scuttlebutt</a> social networking protocol). Once a peer has found a route to its contact via any of these methods, a direct connection between them is made.</p>
 
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 <div class="container">
   <div class="row">
     <div class="col-md-6">
-    <h3>Advantages</h3>
+    <h4>Advantages</h4>
     <ul>
       <li>Minimal information is exposed to third parties.</li>
       <li>Modern P2P platforms implement end-to-end encryption by default. There are no servers that could potentially intercept and decrypt your transmissions, unlike centralized and federated models.</li>
     </ul>
     </div>
     <div class="col-md-6">
-      <h3>Disadvantages</h3>
+      <h4>Disadvantages</h4>
       <ul>
         <li>Reduced feature set:</li>
         <ul>