Add default content type configuration

Updated config.example.toml to include a default content type option for
toots, allowing users to set a preferred type (e.g. text/plain or
text/markdown) for supported backends.

config.example.toml

@@ -129,6 +129,10 @@ leader-key=""
 # default=1000
 leader-timeout=1000
 
+# If the backend supports it (e.g. Pleroma, Akkoma and Friendica), you can set
+# the default content type for toots here (usually text/plain or text/markdown).
+default-content-type="text/plain"
+
 # [[general.timelines]]
 # Timelines adds panes of feeds. You can customize the number of feeds, what
 # they should show and the key to activate them.

config/toml.go

@@ -8,7 +8,6 @@ type ConfigTOML struct {
 	OpenCustom         OpenCustomTOML    `toml:"open-custom"`
 	NotificationConfig NotificationsTOML `toml:"desktop-notification"`
 	Input              InputTOML         `toml:"input"`
-	DefaultContentType string 			 `toml:"default-content-type"` // e.g. "text/plain" or "text/markdown"
 }
 
 type GeneralTOML struct {