added logout button

[samagragupta]

Fixes #452

Checklist

• [x] I have read the Contribution & Best practices Guide and my PR follows them.
• [x] My branch is up-to-date with the Upstream master branch.
• [x] The unit tests pass locally with my changes
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] I have added necessary documentation (if appropriate)
• [ ] All the functions created/modified in this PR contain relevant docstrings.

Short description of what this resolves:

Changes proposed in this pull request:

Fixed logout toggle when the user login

[samagragupta]

@gabru-md @ms10398 please review

[samagragupta]

@gabru-md @hkedia321 Please review

[samagragupta]

@fragm3 Made the changes.

[samagragupta]

@fragm3 the commits are not squashing. Can you not merge it directly?

[fragm3]

@samagragupta each PR for merge needs the approval of at least 2 mentors. Please rebase and merge commits from your end

[samagragupta]

@stealthanthrax @gabru-md Please review.

[samagragupta]

@Orbiter @akshatnitd Please review.

[samagragupta]

@fragm3 Sorry, But I am not able to squash them, there is some problem. Can you please merge it directly.