Update DOCS.md

DOCS.md

@@ -24,6 +24,10 @@
 - You need to edit a privately hosted gsheet containing the list of events.
 - Convert to base64 and replace it to the path in `src/routes/events/+page.svelte`
 - Whatever events you add to the sheet shall automatically reflect onto the website.
+- TODO:
+  - Current sheet has been deleted (thanks to Google's storage policy for BITS alumni)
+  - Refer to [Thales](https://thales.sedscelestia.org/docs/Korolev/data/) for creation of API sheet again.
+  - Host the sheet on a non-BITSian account so that it isn't deleted in future.
 
 ### Routes and Social Info