chore: Add single lint setting to package.json

Author: potato4d

package.json

@@ -14,7 +14,8 @@
     "serve": "vuepress dev src",
     "build": "vuepress build src",
     "test": "npm run lint",
-    "lint": "node -e \"var shell=require('shelljs');var files=shell.find(['./src/**/*.md']).filter(function(file){return !file.endsWith('/guide/team.md')}).join(' ');if(shell.exec('textlint --rulesdir ./node_modules/textlint-checker-for-vuejs-jp-docs/rules/textlint-rule-vue-jp-docs -f pretty-error '+files).code!==0){shell.exit(1)};\""
+    "lint": "node -e \"var shell=require('shelljs');var files=shell.find(['./src/**/*.md']).filter(function(file){return !file.endsWith('/guide/team.md')}).join(' ');if(shell.exec('textlint --rulesdir ./node_modules/textlint-checker-for-vuejs-jp-docs/rules/textlint-rule-vue-jp-docs -f pretty-error '+files).code!==0){shell.exit(1)};\"",
+    "lint:single": "textlint --rulesdir ./node_modules/textlint-checker-for-vuejs-jp-docs/rules/textlint-rule-vue-jp-docs -f pretty-error"
   },
   "dependencies": {
     "@docsearch/css": "^1.0.0-alpha.27",