Add Squirrel Servers Manager to awesome-sysadmin

[SquirrelDeveloper]

Following awesome-selfhosted/awesome-selfhosted-data#929

Thank you for taking the time to work on a PR for Awesome-Sysadmin!

To ensure your PR is dealt with swiftly please check the following:

• Your additions are Free software
• Software your are submitting is not your own, unless you have a healthy ecosystem with a few contributors (which aren't your sock puppet accounts).
• Submit one item per pull request. This eases reviewing and speeds up inclusion.
• Format your submission as follows, where Demo and Clients are optional.
  Do not add a duplicate Source code link if it is the same as the main link.
  Keep the short description under 80 characters and use sentence case
  for it, even if the project's webpage or readme uses another capitalisation.
  Demo links should only be used for interactive demos, i.e. not video demonstrations.
  - [Name](http://homepage/) - Short description, under 250 characters, sentence case. ([Demo](http://url.to/demo), [Source Code](http://url.of/source/code), [Clients](https://url.to/list/of/related/clients-or-apps)) `License` `Language`
• Additions are inserted preserving alphabetical order.
• Additions are not already listed at awesome-selfhosted
• The Language tag is the main server-side requirement for the software. Don't include frameworks or specific dialects.
• You have searched the repository for any relevant issues or PRs, including closed ones.
• Any category you are creating has the minimum requirement of 3 items.
• Any software project you are adding to the list is actively maintained.
• The pull request title is informative, unlike "Update README.md".
  Suggested titles: "Add aaa to bbb" for adding software aaa to section bbb,
  "Remove aaa from bbb" for removing, "Fix license for aaa", etc.

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Please take some time to answer the following questions as best you can:

• Why is it awesome?

Squirrel Servers Manager (SSM) offers a free and open-source alternative to well-known paid software. It focuses on user interface (UI) and user experience (UX), providing a polished and easy-to-navigate interface.

• Have you used it? For how long?

I am the developer of the software and have been using it daily for over 8 months.

• Is this in a personal or professional setup?

Personal

• How many devices/users/services/... do you manage with it?

I manage 15 devices.

• Biggest pros/cons compared to other solutions?

Pros:

• Easy to use
• All in one solution for docker container management and host configuration management

Cons:

• The project is still in early development, so breaking changes can occur.

• The all-in-one approach may not suit everyone, as the project is quite large.

• Any other comments about your use case, things you've found excellent, limitations you've encountered... ?

[anonhostpi]

The weather seems a bit shilly today. I should probably go water my astroturf 😏😏🤔🤔🤔