Add usulnet to web Docker management tools list (#1242)

Adds usulnet to the Web Management section.

usulnet is a self-hosted Docker management platform built with Go.
It provides multi-node orchestration, security scanning, in-browser
terminal/editor, backups, TOTP, and granular RBAC from a single web UI.

I use it to manage Docker infrastructure across multiple servers and have all my ssh, scan for CVEs on containers, deploy stacks and much more.

https://github.com/fr4nsys/usulnet

README.md

@@ -464,6 +464,7 @@ Native desktop applications for managing and monitoring docker hosts and cluster
 -   [Swarmpit](https://github.com/swarmpit/swarmpit) - Swarmpit provides simple and easy to use interface for your Docker Swarm cluster. You can manage your stacks, services, secrets, volumes, networks etc.
 -   [Swirl](https://github.com/cuigh/swirl) - Swirl is a web management tool for Docker, focused on swarm cluster By [@cuigh](https://github.com/cuigh/)
 -   [Theia](https://github.com/eclipse-theia/theia) - Extensible platform to develop full-fledged multi-language Cloud & Desktop IDE-like products with state-of-the-art web technologies.
+-   [usulnet](https://github.com/fr4nsys/usulnet) - A complete and modern Docker management platform designed for sysadmin, devops with enterprise grade tools, cve scanner, ssh, rdp on web and much more. By [@fr4nsys](https://github.com/fr4nsys)
 -   [Yacht](https://github.com/SelfhostedPro/Yacht) :construction: - A Web UI for docker that focuses on templates and ease of use in order to make deployments as easy as possible. By [@SelfhostedPro](https://github.com/SelfhostedPro)
 
 ## Docker Images