Add short_description field

Signed-off-by: marcin mikołajczak <git@mkljczk.pl>

config/config.exs

@@ -187,6 +187,7 @@ config :pleroma, :instance,
   email: "example@example.com",
   notify_email: "noreply@example.com",
   description: "Pleroma: An efficient and flexible fediverse server",
+  short_description: "",
   background_image: "/images/city.jpg",
   instance_thumbnail: "/instance/thumbnail.jpeg",
   limit: 5_000,

config/description.exs

@@ -536,6 +536,15 @@ config :pleroma, :config_description, [
           "Very cool instance"
         ]
       },
+      %{
+        key: :short_description,
+        type: :string,
+        description:
+          "Shorter version of instance description. It can be seen on `/api/v1/instance`",
+        suggestions: [
+          "Cool instance"
+        ]
+      },
       %{
         key: :limit,
         type: :integer,