logout route at multiple places

[lazycipher]

Describe the enhancement you'd like
Currently, there are two logout routes and controllers which is certainly unnecessary!

social-platform-donut-backend/app/routes/user.js

Line 76 in b59ccca

// LOGOUT USER

social-platform-donut-backend/app/routes/auth.js

Line 14 in b59ccca

// user logout

Describe approaches if you have thought of any
Remove any of those unless there's a valid reason to keep both. If we've to keep both, mention the same in code comments.

Additional context
NA

[lazycipher]

@Rupeshiya, Please have a look into this!