Move actions into context menu, add support for deleting a backup

resources/scripts/api/server/backups/deleteBackup.ts

@@ -0,0 +1,9 @@
+import http from '@/api/http';
+
+export default (uuid: string, backup: string): Promise<void> => {
+    return new Promise((resolve, reject) => {
+        http.delete(`/api/client/servers/${uuid}/backups/${backup}`)
+            .then(() => resolve())
+            .catch(reject);
+    });
+};