feat: add subscribe page.

.subscribe/index.html

@@ -0,0 +1,15 @@
+<form method="post" action="https://listmonk.nunosempere.com/subscription/form" class="listmonk-form">
+    <div>
+            <h3>Subscribe</h3>
+            <input type="hidden" name="nonce" />
+            <p><input type="email" name="email" required placeholder="E-mail" /></p>
+            <p><input type="text" name="name" placeholder="Name (optional)" /></p>
+          
+            <p>
+              <input id="82ff8" type="checkbox" name="l" checked value="82ff889c-f9d9-4a45-bf9a-7e2696813021" />
+              <label for="82ff8" style="font-size: 18px">nunosempere.com</label>
+            </p>
+
+        <p><input type="submit" value="Subscribe" class="button"/></p>
+    </div>
+</form>