docs: add link to devexpress documentation

[GusevAlexander-DevExpress]

docs: add info about devexpress blazor components support testing with bunit and links to devexpress documentation

Pull request description

PR meta checklist

• Pull request is targeted at main branch for code
  or targeted at stable branch for documentation that is live on bunit.dev.
• Pull request is linked to all related issues, if any.
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• My change requires a change to the documentation.
  • I have updated the documentation accordingly.
• I have updated the appropriate sub section in the CHANGELOG.md.
• I have added, updated or removed tests to according to my changes.
  • All tests passed.

[GusevAlexander-DevExpress]

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[linkdotnet]

Hey @GusevAlexander-DevExpress

Thanks for making the contribution! A small few things I noticed.

1. Ideally (as this is a docs update) we target stable branch so it goes "live immediately"
2. The documentation is showing the setup for v1 which is deprecated and therefore if folks using the latest version, the shown documentation does not really work anymore.