Continued improving UI

Today I continued to improve the UI. I'm not good at it so I will stop trying to make improvements until I learn UI design more thoroughly later.

Today:

1. Animated the rocket
2. Tried animating the clouds. Too much work or too complex without an animation library. I will learn animation libraries later
3. Added smooth scrolling
4. Switch logout from button to link
5. Styled course presentation page
6. Styled course content page

Next:

1. Implement design tips from my cousin João
2. Work on the copy
3. Update the course videos
4. Work on the marketing