Modal Design for Collection Manage

[kosumin]

Related Issue: #141

Major changes

1. Implement infinite Scrolling on modals related to collection

( Invite )

( Manage )

(Kick Off)

(Transfer)

Minor changes

1 Minor Css Changes

(Warning)

Checklist

This pull request...

• [x] has preceding issues related with it (if resolves some issues, metions them with 'resolve')
• [x] doesn't include too many changes (you should focus on the specific feature in a PR)
• [x] elaborately explains what feature is added, which part is fixed or improved
• [x] has step by step instructions for collaborators, if needed
• [x] has attached screenshots, if appropriate

My codes...

• [ ] include enough tests for added and changed parts
• [x] pass all the new and existing tests
• [ ] include appropriate comments
• [x] don't introduce unnecessary warnings