feat: provide default contest config

lua/cp/config.lua

@@ -68,27 +68,20 @@
 local M = {}
 local constants = require('cp.constants')
 
+local default_cpp_config = {
+  cpp = {
+    compile = { 'g++', '-std=c++17', '{source}', '-o', '{binary}' },
+    debug = { 'g++', '-std=c++17', '-fsanitize=address,undefined', '{source}', '-o', '{binary}' },
+    extension = 'cpp',
+  },
+}
+
 ---@type cp.Config
 M.defaults = {
   contests = {
-    default = {
-      cpp = {
-        compile = { 'g++', '{source}', '-o', '{binary}', '-std=c++17' },
-        test = { '{binary}' },
-        debug = {
-          'g++',
-          '{source}',
-          '-o',
-          '{binary}',
-          '-std=c++17',
-          '-g',
-          '-fsanitize=address,undefined',
-        },
-      },
-      python = {
-        test = { 'python3', '{source}' },
-      },
-    },
+    codeforces = default_cpp_config,
+    atcoder = default_cpp_config,
+    cses = default_cpp_config,
   },
   snippets = {},
   hooks = {