Update Registration Page

[thealphadollar]

We've reached a point where Github login is working perfectly and we need to move onto student registration. Here is the proposed method:

• Provide Github login as the ONLY method. -See if the user is already registered (this can be done by checking if we have the [unique] github username already in the student's JSON) (this has been done)
• If the username is already in the list, we redirect the student directly to the dashboard; otherwise he is asked to fill a form which has all the details we could get from github about him and he is supposed to check, complete and submit it. We should also have a better way of managing the college details for which we should rather have a drop-down with college names and let the user select from it. This would reduce discripancies like "IIT" and "Indian Institute of Technology".

Here is the list of Indian colleges: https://www.4icu.org/in/indian-universities.htm

[WHAT TO DO] Once the details from github has been fetched, under the condition that user is already present do not send him to registraion page and redirect him to dashboard directly. If the user is not present, direct him to the registration page and prefill the details we've got such as github username, email, avatar url etc.

One more thing is that here only the list of colleges is to be provided as a drop down and once it's selected update the university stats which is currently being done in kwoc/app.py itself.

Once the student has filled all the details; update the dictionary associated with the user (UPDATE gh_login/gh_login_students.json ONLY) with new keys for the additional details.

@yashrsharma44 Since you are most familiar with the above work, if you've time please do this. We already have the registration page and thus it shouldn't take much time. @xypnox If there are some design improvements needed in registraion form please suggest.

[yashrsharma44]

@thealphadollar Do we have the registration page ready?

[thealphadollar]

@yashrsharma44 We will also keep an option to add university if it is not present in the dropdown and then add this university to the list.

[themousepotato]

@thealphadollar @yashrsharma44 I'm working on adding an option to choose a college.

[thealphadollar]

Fixed via #63