Extract the render ready status into an extra redux state

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

src/redux/renderer-status/methods.ts

@@ -0,0 +1,21 @@
+/*
+ * SPDX-FileCopyrightText: 2021 The HedgeDoc developers (see AUTHORS file)
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { store } from '..'
+import { RendererStatusActionType, SetRendererStatusAction } from './types'
+
+/**
+ * Dispatches a global application state change for the "renderer ready" state.
+ *
+ * @param rendererReady The new renderer ready state.
+ */
+export const setRendererStatus = (rendererReady: boolean): void => {
+  const action: SetRendererStatusAction = {
+    type: RendererStatusActionType.SET_RENDERER_STATUS,
+    rendererReady
+  }
+  store.dispatch(action)
+}