Fix horizontal scroll

Dockerfile

@@ -1,4 +1,4 @@
-FROM rust:1 as builder
+FROM rust:latest as builder
 
 RUN apt-get update && apt-get install -y --no-install-recommends \
     ca-certificates \

assets/themes/default/_header.scss

@@ -37,6 +37,10 @@ body > header {
     flex-direction: row;
     align-items: center;
 
+    &.right-nav {
+      overflow-x: hidden;
+    }
+
     hr {
       height: 100%;
       width: 0.2em;

templates/base.rs.html

@@ -32,7 +32,7 @@
                     <hr/>
                     @:header()
                 </nav>
-                <nav>
+                <nav class="right-nav">
                     @if ctx.2.is_some() {
                         <a href="@uri!(search::search: _)">
                             <i class="icon icon-search"></i>