make wallpaper url configurable

example_config.py

@@ -21,6 +21,8 @@ SITE_AUTHOR      = "Site Author"
 SITE_LOGO_URL    = "Site Logo URL"
 SITE_BASE_URL    = "Site Base URL"
 
+WALLPAPER_URL    = "/picture/example.png"
+
 TEAMSPEAK_SERVER = "teamspeak.com"
 DISCORD_SERVER   = "https://discord.gg/",
 FACEBOOK         = "https://www.facebook.com/",

static/site.css

@@ -5,7 +5,6 @@ html {
 .masthead {
   height: 50vh;
   min-height: 250px;
-  background-image: url('/static/pictures/wallpaper.jpg');
   background-size: cover;
   background-position: center;
   background-repeat: no-repeat;

templates/index.html

@@ -15,7 +15,7 @@
 {% include 'navbar.html' %}
 
 <!-- Site wellcome header -->
-<header class="masthead">
+<header class="masthead" style="background-image: url('{{ conf["WALLPAPER_URL"] }}');">
   <div class="container h-50">
     <div class="row h-100 align-items-center">
         <div class="col-12 text-center">