Update requirements and enhance CSS styles

- Added new dependencies to requirements.txt: psycopg2-binary, pandas, and dotenv for improved functionality.
- Enhanced main.css by adding 'scroll-smooth' to the html element for better scrolling experience.

i18n/locales/en.json

@@ -13,7 +13,8 @@
       "miniWikipedia": "Mini Wikipedia",
       "newsComparePlatform": "news comparison platform"
     },
-    "startusing": "Let's Start!"
+    "startusing": "Let's Start!",
+    "learnmore": "Learn More",
   },
   "dailybriefing": "Daily Briefing",
   "Welcome": "Welcome",

i18n/locales/zh-tw.json

@@ -13,7 +13,8 @@
       "miniWikipedia": "米你維基百科",
       "newsComparePlatform": "新聞觀點比對平台"
     },
-    "startusing": "開始使用!"
+    "startusing": "開始使用!",
+    "learnmore": "了解更多"
   },
   "dailybriefing": "今日報導",
   "Welcome": "歡迎",