chore(cpex): Disable CPEx for AY25/26 S1 and update maintenance guide (#4029)

* Enable cpex

* Disable cpex

* Update maintenance guide for cpex update announcements

* fix to hide cpex tab too

---------

Co-authored-by: Ravern Koh <[email protected]>

Author: jloh02

MAINTENANCE.md

@@ -21,7 +21,7 @@ Reference PRs: [PR #3286](https://github.com/nusmodifications/nusmods/pull/3286)
 
 - [ ] Update semester in `website/src/config/app-config.json`
 - [ ] In `app-config.json`, add semester to `examAvailability` to indicate exam information is available for the semester
-- [ ] Update the ModReg schedule in `website/src/data/modreg-schedule.json`, and make sure the correct version is pointed to in `website/src/config/index.ts`  
+- [ ] Update the ModReg schedule in `website/src/data/modreg-schedule.json`, and make sure the correct version is pointed to in `website/src/config/index.ts`
   - Reference PR: [PR #2764](https://github.com/nusmodifications/nusmods/pull/2764)
 
 ## CPEx
@@ -30,7 +30,7 @@ Reference PRs: [PR #3286](https://github.com/nusmodifications/nusmods/pull/3286)
   - [ ] Update `TERM` in `scrapers/cpex-scraper/src/index.ts` and `MPE_SEMESTER` in `website/src/views/mpe/constants.ts` to be the semester you're configuring CPEx for (usually the next semester)
   - [ ] Update the displayed dates in `website/src/views/mpe/MpeContainer.tsx` and any new requirements/descriptions
   - [ ] Enable the `enabledCPEx` flag in `website/src/featureFlags.ts`
-  - [ ] Add a new entry in the ModReg schedule in `website/src/data/modreg-schedule.json`
+  - [ ] Update dates in the ModReg schedule in `website/src/data/modreg-schedule.json`
     - Reference PR: [PR #3832](https://github.com/nusmodifications/nusmods/pull/3832)
   - [ ] Once merged into `master`, visit https://latest.nusmods.com/cpex and verify that NUS authentication is working
   - [ ] Deploy latest `master` to `production`
@@ -42,6 +42,5 @@ Reference PRs: [PR #3286](https://github.com/nusmodifications/nusmods/pull/3286)
   - [ ] Prepare PR to disable the `enabledCPEx` and `showCPExTab` flags in `website/src/featureFlags.ts`
 - After
   - [ ] Disable the `enabledCPEx` and `showCPExTab` flags in `website/src/featureFlags.ts`
-  - [ ] Remove CPEx from the ModReg schedule in `website/src/data/modreg-schedule.json`
   - [ ] Merge into `master`
   - [ ] Deploy latest `master` to `production`

website/src/featureFlags.ts

@@ -1,6 +1,6 @@
 /* eslint-disable import/prefer-default-export */
 
 /** Enable Course Planning Exercise */
-export const enableCPEx = true;
+export const enableCPEx = false;
 
-export const showCPExTab = true;
+export const showCPExTab = false;