Refactor/mentors form

[joandong2]

Description

• Added add/delete/edit functions to mentors component
• added user notification after action request
• fix redux issues and modal screen sizes

Type

• This is a bug fix
• This is a new feature
• This refactors a feature
• This is to improve performance

Organization

• Have you linked this pull request to a Trello card?
• Have you named the branch in the format of feature/describe_feature_or_change or in the format of bug/describe_bug_this_fixes?
• Did you add screenshots of your code or the application?

Review

• Is this a work in progress?
• Is this ready to be reviewed?
• Have you added two reviewres to this pull request and dropped a message in slack?