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.

layouts/default.vue

@@ -12,4 +12,4 @@ import Footer from "~/components/footer.vue";
   <footer>
     <Footer />
   </footer>
-</template>
+</template>