Add DevHub (#135)

DevHub is a European company that offers free and paid Gitea hosting services to professionals and companies.
Based in Europe and with strong focus on Security, Privacy and Performance.

Reviewed-on: https://gitea.com/gitea/awesome-gitea/pulls/135
Reviewed-by: delvh <dev.lh@web.de>
Reviewed-by: silverwind <silverwind@noreply.gitea.com>
Co-authored-by: Leandro David Cacciagioni <leandro.21.2008@gmail.com>
Co-committed-by: Leandro David Cacciagioni <leandro.21.2008@gmail.com>

README.md

@@ -116,6 +116,7 @@ A curated list of awesome projects related to Gitea and its soft-fork instances.
 
 - [Blender](https://projects.blender.org) - The Blender Projects portal where all the (Blender) official initiatives are coordinated and managed.
 - [FSFE](https://git.fsfe.org/) - Git @ Free Software Foundation Europe
+- [DevHub](https://dev-hub.eu/) - Free and paid Gitea Server & Gitea Actions Runners with strong focus on Security, Privacy and Performance.
 - [openSUSE](https://gitea.opensuse.org/) - openSUSE Gitea
 - [PSES](https://git.passageenseine.fr/pses) - Git @ Pas Sage en Seine.
 - [Sum7](https://dev.sum7.eu/) - A hoster to support decentralized services. A step away from big cloud services.