UI changes

[VaibhaveS]

• The error page in clustering module has to be changed to a professional one

• The loading page in emotional analysis is transparent, and the robot image looks odd because of the white background

• Footer has to be added to all page modules, please paste the footer code in footer.html and remove the existing footer code in home.html, everyone else extend it in your modules.

[VaibhaveS]

Anything else related to UI, add here