Feature/FE-29 - Githubissues

Online Exhibition related interfaces are designed, implemented and connected to backend. In detail I implemented the followings:

Renewed the tab structure of the profile page to comply with the exhibitions.
Implemented the grid of online exhibition posters to be identical to the art item tab grid. Other users are able to access the posters of the user's exhibitions from the user's online exhibitions tab.
Online exhibition post interfaces such as form, art item previews , redirections, pop-ups are designed and implemented and necessary api calls are made.
Online exhibition page interface is designed and implemented and necessary api calls are made.
Online exhibition deletion feature is implemented.
Updated other people's profile page to show their online exhibitions.

bounswe / bounswe2022group8