[airgradient] Add logo for recently added binding

[austvik]

[airgradient] Add logo for recently added binding

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[jlaur]

@austvik - do you have an SVG version of the logo that could be used instead? See https://next.openhab.org/docs/developer/addons/#add-your-add-on-s-logo-to-the-openhab-website-and-the-ui

[austvik]

Great! Added svg now.

I looked at this page where it wasn't mentioned as a possibility, but the original was svg so this is an improvement https://www.openhab.org/docs/developer/addons/#add-your-add-on-s-logo-to-the-openhab-website

[austvik]

I have checked the error and do not see how it is relevant for adding a .svg file: "Error: developers/bindings/thing-xml.md:930:189 MD009/no-trailing-spaces Trailing spaces [Expected: 0 or 2; Actual: 3]"

[stefan-hoehn]

The error doesn't come from your PR - it is probably from somewhere else. I will merge anyway.

[austvik]

Thank you!