Modernized the plugin

Implemented fixes from Gitlab issues
from Marc Hagen & Trent Robinson (https://gitlab.com/jackgreyhat/librenms-speedtest/-/issues/2)
and fixes from m0nsieur Psych0 (https://gitlab.com/jackgreyhat/librenms-speedtest/-/issues/6)

I added support for darkmode, this is done by generating the graphs with white text, then using CSS to invert the image, for light mode users.

I also moved branding PNGs to vectors for higher resolutions

I will not be opening a PR at https://gitlab.com/jackgreyhat/librenms-speedtest as this seems to have been abbandoned.

images/ookla-logo.svg

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images/speedtest-logo.svg

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