settings: add "tasks" button (advanced)

added a GET /tasks route to list tasks with a description (untranslated,
but this is mostly a dev feature anyway). Loaded in a modal by enabling
advanced settings and pressing the Tasks button at the top (where logs,
backups, restart are). Also added some icons in settings, and removed
some redundant "flex flex-row"s on buttons and reduced the spacing in
those with icons to gap-1.

models.go

@@ -492,3 +492,13 @@ type PagePathsDTO struct {
 	// The subdirectory the app is meant to be accessed from ("Reverse proxy subfolder")
 	TrueBase string `json:"TrueBase"`
 }
+
+type TasksDTO struct {
+	Tasks []TaskDTO `json:"tasks"`
+}
+
+type TaskDTO struct {
+	URL         string `json:"url"`
+	Name        string `json:"name"`
+	Description string ` json:"description"`
+}