Add /home endpoint to header template

Used in header templates for navigating back to the home page when
behind a reverse proxy config where the app is running from a subpath of
a domain (i.e. "https://something/whoogle/")

Fixes #403

app/routes.py

@@ -115,6 +115,11 @@ def healthz():
     return ''
 
 
+@app.route('/home', methods=['GET'])
+def home():
+    return redirect(url_for('.index'))
+
+
 @app.route('/', methods=['GET'])
 @auth_required
 def index():

app/templates/header.html

@@ -4,7 +4,7 @@
             <form class="search-form Pg70bf"
                 id="search-form"
                 method="{{ 'GET' if config.get_only else 'POST' }}">
-                <a class="logo-link mobile-logo" href="/">
+                <a class="logo-link mobile-logo" href="home">
                     <div id="mobile-header-logo">
                         {{ logo|safe }}
                     </div>
@@ -35,7 +35,7 @@
 {% else %}
     <header>
         <div class="logo-div">
-            <a class="logo-link" href="/">
+            <a class="logo-link" href="home">
                 <div class="desktop-header-logo">
                     {{ logo|safe }}
                 </div>