Moving slippy components in their own directory.

src/store/slippy.ts

@@ -1,8 +1,13 @@
 import { createSlice } from '@reduxjs/toolkit';
 
-import { ViewportState } from '../components/viewport';
+import { Point } from '../components/slippy/index';
 
-const initialSlippyState: ViewportState = {
+export interface SlippyState {
+    scale: number;
+    translation: Point;
+  }
+  
+const initialSlippyState: SlippyState = {
   scale: 1,
   translation: { x: 0, y: 0 },
 };