core: simplify default discussion nodes

packages/hydrooj/src/model/builtin.ts

@@ -292,50 +292,15 @@ export const DEFAULT_NODES = {
         { name: '月赛' },
         { pic: 'advice', name: '建议' },
     ],
-    数据结构: [
-        { name: '散列表' },
-        { name: '搜索树' },
-        { name: '栈和队列' },
-        { name: '图' },
-        { name: '堆' },
-    ],
-    算法: [
-        { name: '数论' },
-        { name: '几何' },
-        { name: '图论' },
-        { name: '网络流' },
-        { name: '动态规划' },
-        { name: '背包' },
-        { name: '排序' },
-        { name: '搜索' },
-        { name: '并查集' },
-        { name: '贪心' },
-        { name: '博弈论' },
-    ],
-    在线题库: [
-        { name: 'CodeForces' },
-        { name: 'TopCoder' },
-        { name: 'POJ' },
-        { name: 'BZOJ' },
-        { name: 'USACO' },
-        { name: 'RQNOJ' },
-        { name: 'UOJ' },
-        { name: 'LOJ' },
-        { name: '洛谷' },
-    ],
     泛: [
         { name: '数学' },
         { name: '编程' },
-        { name: '数据库' },
         { name: 'C' },
         { name: 'C++' },
-        { name: 'Pascal' },
         { name: 'Java' },
         { name: 'PHP' },
         { name: 'Python' },
-        { name: 'Julia' },
-        { name: '游戏' },
-        { name: '保送' },
+        { name: 'Rust' },
         { name: 'ACM' },
     ],
 };