Swagger-UI integration improvement

[preriasusi]

"As a end user I want to see Swagger UI seamlessly integrated to APInf so that I can have great experiense."

ToDo:

• [x] Fork Swagger UI to APinf
• [x] Valid button away unless there's a reason to keep it.
• [ ] Description of Swagger Ui to explain what OpenAPI Speficiation versions it supports.
• [ ] Error handling if something goes wrong in upload. Error(s) has to be shown clearly so that API owner gets the point what went wrong.
• [x] Swagger UI uses same font style as platform
• [x] Remove the green block having the URL and title.

[55]

related #3360

[marla-singer]

Link to repo https://github.com/apinf/swagger-ui

[Nazarah]

Error Handling and Description todos will be implemented as separate tasks. CLosing this issues.