feat: implement periodic shopify sales sync

- automated sales check (default 10 mins)

- manual reconciliation menu

- updates 'status' and 'shopify_status' in sheet

- updated docs

src/config.ts

@@ -10,6 +10,7 @@ export class Config {
   shopifyLocationId: string
   shopifyCountryCodeOfOrigin: string
   shopifyProvinceCodeOfOrigin: string
+  salesSyncFrequency: number
 
   constructor() {
     let ss = SpreadsheetApp.getActive()
@@ -69,5 +70,12 @@ export class Config {
       "shopifyProvinceCodeOfOrigin",
       "value"
     )
+    let freq = vlookupByColumns(
+      "vars",
+      "key",
+      "SalesSyncFrequency",
+      "value"
+    )
+    this.salesSyncFrequency = freq ? parseInt(freq) : 10
   }
 }