added logout option

[Madhav-495]

I have made change in partial file of header to add logout button and then aded a logout route that would redirect user to home page on a get request

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Related Issue

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Type of change

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] This change requires a documentation update

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Checklist:

• [ ] I have registered myself at Contrihub website.
• [ ] My code follows the code style of this project.
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] My changes generate no new warnings
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [ ] I have read the CONTRIBUTING document.
• [ ] Any dependent changes have been merged and published in downstream modules
• [ ] I have added tests to cover my changes.
• [ ] All new and existing tests passed.

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