Issue #5112

Issue #5112

Removing the broken links in the realworld users list. I checked the backlinks using,

https://www.deadlinkchecker.com/website-dead-link-checker.asp

and manually verified these urls to be invalid.

Adding Codiva.io Online Java Compiler and IDE to the existing users list.

This will highlight some of the advanced usage of Codemirror

- Multiple Tabbed editor
- Continuous compilation in the backend
- Autocompletion
- Mobile friendly
- Read-only mode

That overlay modes can use to access the underlying token info.

Improved the description of "make the problem occur", explaining that maintainers want to reproduce the error.

Issue #4929