doc(maintenance): How to update majors / minors

documentation/ProdRelated/updateMajorMinor.md

+# Update majors / minors
+
+In case of changes of majors / minors at the UTC, the frontend filter utils need to be updated.
+
+In `frontend/src/utils/majorMinorMappings.js`, each change has to be added as a new line in either `majorMapping` or `minorMapping` like this:
+
+```js
+export const majorMapping = {
+  oldMajorName: "newMajorName",
+};
+
+export const minorMapping = {
+  majorName: {
+    oldMinorName: "newMinorName",
+  },
+};
+```

documentation/_sidebar.md

@@ -39,6 +39,9 @@
 
   - [Architecture](ProdRelated/architecture.md)
   - [Dump database](ProdRelated/dump_database.md)
+  - Maintenance
+
+    - [Update major minor](ProdRelated/updateMajorMinor.md)
 
 * Comments about technologies used