Improve the UX for the pages representing a missing/non-existing information

[frol]

Story

As a user, I want to clearly understand if the data is not found so I can reason about the data I have.

Currently, 404 pages are not very informative, and the tables look completely broken:

Acceptance Criteria

• [ ] The fact of the missing information is clearly communicated
• [ ] All the relevant pages are covered
  • [ ] Account Details
  • [ ] Block Details
  • [ ] Transaction Details
• [ ] Tested