Add a default card image when no custom one exists (#23)

* Add a default card image when no custom one exists
* Add coming_soon.png source
* Use directly the svg source instead of the png raster

ram/ram/settings.py

@@ -80,6 +80,7 @@ TEMPLATES = [
                 "django.template.context_processors.request",
                 "django.contrib.auth.context_processors.auth",
                 "django.contrib.messages.context_processors.messages",
+                "portal.context_processors.default_card_image",
             ],
         },
     },
@@ -148,6 +149,10 @@ COUNTRIES_OVERRIDE = {
     "ZZ": "Freelance",
 }
 
+# Image used on cards without a custom image uploaded.
+# The file must be placed in the root of the 'static' folder
+DEFAULT_CARD_IMAGE = "coming_soon.svg"
+
 DECODER_INTERFACES = [
     (1, "NEM651"),
     (2, "NEM652"),