Markdown conversion (#529)

Co-authored-by: Daniel Gray <dng@disroot.org>

_includes/card.html

@@ -0,0 +1,5 @@
+<div class="card my-5">
+    <div class="card-body">
+        {{ include.content | default: markdown_text | markdownify }}
+    </div>
+</div>

_includes/legacy/sections/email-warning.html

@@ -5,6 +5,6 @@
       <p class="card-text text-danger">When using end-to-end encryption (E2EE) technology like <a href="https://en.wikipedia.org/wiki/Pretty_Good_Privacy">OpenPGP</a>, email will still have some metadata that is not encrypted in the header of the email. <a href="/providers/email/#metadata">Read more about email metadata.</a></p>
       <p class="card-text text-danger">OpenPGP also does not support <a href="https://en.wikipedia.org/wiki/Forward_secrecy">Forward secrecy</a>, which means if either your or the recipient's private key is ever stolen, <strong>all</strong> previous messages encrypted with it will be exposed. <a href="/providers/email/#email-encryption">How do I protect my private keys?</a></p>
       <p class="card-text text-info">Rather than use email for prolonged conversations, consider using a medium that does support Forward secrecy.</p>
-      <a href="/real-time-communication/" class="btn btn-outline-info">Recommended Instant Messengers</a>
+      <a href="/software/real-time-communication/" class="btn btn-outline-info">Recommended Instant Messengers</a>
     </div>
 </div>

_includes/media-left.html

@@ -0,0 +1,8 @@
+<div class="d-flex">
+  <div class="flex-shrink-0">
+    <img src="{{ include.src }}" width="{{ include.width | default: 150 }}" height="{{ include.height | default: 150 }}" alt="{{ include.alt }}" />
+  </div>
+  <div class="flex-grow-1 ms-3">
+    {{ include.text | markdownify }}
+  </div>
+</div>