Use a themed bootstrap with normalization applied for better responsiveness

Files added:

• static/css/bootstrap-themed.min.css
  Theme from here

Removed animations on each input fields
Removed background blue gradient

Files modified:

• templates/apps/core/students_add.html
• templates/apps/core/words_add.html
• templates/common/base.html
• templates/common/navbar.html

Add Student details page

Add Word page