Add selfh.st/icons support

[LinuxSBC]

Category:

One of: Bugfix / Feature / Code style update / Refactoring Only / Build related changes / Documentation / Other (please specify)

Feature

Overview

Briefly outline your new changes...

Added an icon provider for selfh.st icons, which is a popular and large repository of icons for self-hosted and other applications.

Issue Number (if applicable) N/A

New Vars (if applicable)

If you've added any new build scripts, environmental variables, config file options, dependency or devDependency, please outline here

I don't know if this counts as a config option, but I added support for icons prefixed with sh-, such as icon: sh-home-assistant.

Screenshot (if applicable)

If you've introduced any significant UI changes, please include a screenshot

Code Quality Checklist (Please complete)

• All changes are backwards compatible
• All lint checks and tests are passing
• There are no (new) build warnings or errors
• (If a new config option is added) Attribute is outlined in the schema and documented
• (If a new dependency is added) Package is essential, and has been checked out for security or performance
• (If significant change) Bumps version in package.json

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