added loethennet theme

[sloethen]

[github-actions[bot]]

This pull request has merge conflicts. Please resolve those before requesting a review.

[Piedone]

Thank you for your contribution! It'd have been useful to open an issue first to discuss this, because this is a substantial change that might not fit our roadmap. Following the guidelines, please do this and reply in a comment when done:

If there's no issue for your PR, then please describe the context and rationale in the pull request description, and provide screenshots/screen recordings of the changes if they affect the UX.

If you add a significant new feature or a breaking change, then document this under the release notes of the upcoming release (you can find this in the docs/OrchardCore.Docs/releases folder). [I just clarified this.]

[github-actions[bot]]

It seems that this pull request didn't really move for quite a while. Is this something you'd like to revisit any time soon or should we close? Please comment if you'd like to pick it up.