Add SteamDeckHQ Plugin

[davocarli]

SteamDeckHQ

This plugin allows users to access SteamDeckHQ reviews of game performance for the steam deck, as well as see the SDHQ recommended settings for the games inside of the Steam UX.

Task Checklist

Developer

• I am the original author or an authorized maintainer of this plugin.
• I have abided by the licenses of the libraries I am utilizing, including attaching license notices where appropriate.

Plugin

• I have verified that my plugin works properly on the Stable and Beta update channels of SteamOS.
• I have verified my plugin is unique or provides more/alternative functionality to a plugin already on the store.

Backend

• No: I am using a custom backend other than Python.
• No: I am using a tool or software from a 3rd party FOSS project that does not have it's dependencies statically linked.
• No: I am using a custom binary that has all of it's dependencies statically linked.

Community

• I have tested and left feedback on two other pull requests for new or updating plugins.
• I have commented links to my testing report in this PR.

Testing

• Tested by a third party on SteamOS Stable or Beta update channel.

[AAGaming00]

You should really clean the screens directory up

Also really nice to see this one, sdhq is pretty damn helpful

[EMERALD0874]

• The debug flag in plugin.json should not be used for production-ready code.
• Please provide a more thorough description than "Steam Deck HQ Plugin" in your plugin.json. What is the plugin used for? Something like "Searches Steam Deck HQ for reviews and recommended settings" would be more helpful.
• You did not set a custom image in your plugin.json.
• Your LICENSE file is invalid. "Hypothetical Plugin Developer" is a template name and you need to either substitute in your own name or add your own license on top of Decky's BSD 3 for the plugin template.
• Please remove unused directories like defaults, py_modules, and backend.
• Please either delete your screens folder or provide justification for why it's there. I don't see any of the files referred to anywhere else in the repo.