Add soviet union and fix nav indentation

Signed-off-by: HackerNCoder <hackerncoder@encryptionin.space>

content/soviet-union/contents.lr

@@ -0,0 +1,3 @@
+_model: bib
+---
+title: Soviet Union

templates/nav.html

@@ -3,6 +3,7 @@
         <li{% if this._path == '/' %} class="active"{% endif%}><a href="{{ '/'|url }}">Home</a></li>
         {% for href, title in [
         ['/korea', 'Korea'],
+        ['/soviet-union', 'Soviet Union'],
         ] %}
         <li{% if this.is_child_of(href) %} class="active"{% endif
               %}><a href="{{ href|url }}">{{ title }}</a></li>