write status icon as svg file

[kevinpapst]

• [x] I read CONTRIBUTING.md
• [x] I used tabs to indent
• [x] I checked my code with ShellCheck

Notes

This PR adds one more output file: a SVG image representing the status as "colored dot" and the image filesize will be ~ 165 byte.

I have seen this pretty often in websites, that they want to directly signal whether everything is fine or something might be going on in the infrastructure. For example like this:

One just needs to remember to include the image with a cache breaker URL (eg. an appended timestamp: <a href="status.html">Status page <img src="status.svg?{{ timestamp }}"></a>

Static websites needs to fallback to render the icon with javascript, eg with: document.write('<img src="status.svg?' + Date.now() + '">')

Possible enhancements:

• make colors configurable ?

[Cyclenerd]

Very good idea! Thank you very much.

[kevinpapst]

Thanks for merging! And totally forgot to add a note to the docs, will sent a new PR next week.