Change motd banner to motd modal

Signed-off-by: Tilman Vatteroth <git@tilmanvatteroth.de>

src/redux/motd/methods.ts

@@ -0,0 +1,31 @@
+/*
+ * SPDX-FileCopyrightText: 2021 The HedgeDoc developers (see AUTHORS file)
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { store } from '..'
+import { DismissMotdAction, MotdActionType, SetMotdAction } from './types'
+
+/**
+ * Sets a not-dismissed motd message in the global application state.
+ *
+ * @param text The motd text content
+ * @param lastModified An identifier that describes when the motd was changed the last time.
+ */
+export const setMotd = (text: string, lastModified: string | null): void => {
+  store.dispatch({
+    type: MotdActionType.SET_MOTD,
+    text,
+    lastModified
+  } as SetMotdAction)
+}
+
+/**
+ * Dismisses the currently saved motd message.
+ */
+export const dismissMotd = (): void => {
+  store.dispatch({
+    type: MotdActionType.DISMISS_MOTD
+  } as DismissMotdAction)
+}