refac: frontend supported file extensions

src/lib/constants.ts

@@ -21,9 +21,11 @@ export const SUPPORTED_FILE_TYPE = [
 	'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
 	'application/octet-stream',
 	'application/x-javascript',
-	'text/markdown',
+	'text/markdown'
 ];
 
+export const SUPPORTED_FILE_EXTENSIONS = ['md', 'rst'];
+
 // Source: https://kit.svelte.dev/docs/modules#$env-static-public
 // This feature, akin to $env/static/private, exclusively incorporates environment variables
 // that are prefixed with config.kit.env.publicPrefix (usually set to PUBLIC_).