Issue7 leaderboard improvements

Closes #7

I completely changed the feature and deleted the old leaderboard branch

What I did

Implemented a React Leaderboard feature instead, in the form of a table, and successfully integrated it into the Django project
React leaderboard now pulls data from the MongoDB database and obtains the top 5 users in terms of points
Leaderboard handles ties in points for users who should be featured on the leaderboard.
Leaderboard also has the profile icon feature to improve its aesthetic (profile based on the user's name initials)
Leaderboard allows users to view their own points
Leaderboard has a section to encourage users to earn more points and to check out forum if needed

janel2411 / tradewise