chore: remove and add external links (#3395)

Author: KATO-Hiro

src/lib/constants/external-links.ts

@@ -3,7 +3,8 @@ import {
   ATCODER_PROBLEMS_URL,
   AOJ_ATCODER_JOI_URL,
   AOJ_PCK_URL,
-  ICPC_JAPAN_PROBLEMS_URL,
+  X_URL,
+  MOND_URL,
   GITHUB_URL,
 } from './urls';
 
@@ -12,6 +13,7 @@ export const externalLinks = [
   { title: `AtCoder Problems`, path: ATCODER_PROBLEMS_URL },
   { title: `AOJ / AtCoder-JOI`, path: AOJ_ATCODER_JOI_URL },
   { title: `AOJ-PCK`, path: AOJ_PCK_URL },
-  { title: `ICPC Japan Problems`, path: ICPC_JAPAN_PROBLEMS_URL },
+  { title: `X`, path: X_URL },
+  { title: `mond`, path: MOND_URL },
   { title: `GitHub`, path: GITHUB_URL },
 ];

src/lib/constants/urls.ts

@@ -19,7 +19,9 @@ export const AOJ_ATCODER_JOI_URL: string = 'https://joi.goodbaton.com/';
 
 export const AOJ_PCK_URL: string = 'https://pro-ktmr.github.io/aoj-pck/';
 
-export const ICPC_JAPAN_PROBLEMS_URL: string = 'https://icpc-japan-problems.irrrrr.cc/';
+export const X_URL: string = 'https://x.com/acnovisteps';
+
+export const MOND_URL: string = 'https://mond.how/ja/acnovisteps';
 
 export const GITHUB_URL: string = 'https://github.com/AtCoder-NoviSteps/AtCoderNoviSteps';