Thyme UI integration

[shubhangirai8]

Implemented ThymeLeaf for Login and Registration

[shubhangirai8]

Corrections Needed-

1. The code is not working as expected It should show login and signup both to a non-loggedin user. Currently it shows either Sign in OR Sign up. (For a non-logged in user)
2. The sec:authorize tag are applied only to the the anchor tags . This is not the case tough, rather the Widget of human is showed only for a loggedin user. Here the sec:authorize constraint is not applied to the widget as a whole
3. The location of Sign Up is shifted up due to sec:authorize applied only to the anchor tags.

Please check and run the code locally and ensure its working perfectly before pull request.

@Shubham-Shingate database was not up yesterday, so wasn't able to test. Will test in a while