fix(editor): fix BASE_PATH for Vite dev mode (#4342)

* 🐛 Fix `BASE_PATH` for Vite dev mode

* don't use the string `/{{BASE_PATH}}/` as it gets replaces in build

* fix the static urls on windows

* ffs node 14

Co-authored-by: कारतोफ्फेलस्क्रिप्ट™ <aditya@netroy.in>

packages/editor-ui/src/shims.d.ts

@@ -5,6 +5,10 @@ declare module 'markdown-it-emoji';
 declare module 'markdown-it-task-lists';
 
 declare global {
+	interface Window {
+		BASE_PATH: string;
+	}
+
 	namespace JSX {
 		// tslint:disable no-empty-interface
 		interface Element extends VNode {}