ci: add Makefile and stricter eslint config

src/lib/dates.ts

@@ -1,9 +1,9 @@
 export function simpleDateFormat(date: Date): string {
   return (
-    date.getFullYear() +
-    '-' +
-    (date.getMonth() + 1).toString().padStart(2, '0') +
-    '-' +
-    date.getDate().toString().padStart(2, '0')
-  )
+    date.getFullYear().toString() +
+    "-" +
+    (date.getMonth() + 1).toString().padStart(2, "0") +
+    "-" +
+    date.getDate().toString().padStart(2, "0")
+  );
 }