feat: 更新核心特性的标语以简化表达

Author: Rabithua

frontend/src/locales/en.json

@@ -32,7 +32,7 @@
       "coreFeatures": {
         "title": "Core Features",
         "subtitle": "For a more elegant note-taking experience and less mental burden",
-        "tagline": "Core features designed for a modern note-taking experience",
+        "tagline": "Core features",
         "features": {
           "restraint": {
             "title": "Stay Restrained",

frontend/src/locales/zh.json

@@ -32,7 +32,7 @@
       "coreFeatures": {
         "title": "核心特性",
         "subtitle": "为了更优雅的笔记体验和更少的心智负担",
-        "tagline": "Core features designed for a modern note-taking experience",
+        "tagline": "Core features",
         "features": {
           "restraint": {
             "title": "保持克制",