changed file/folder name structure for logo images

also renamed compid Facebook —> fb, northwestern-mutual —> nw-mutual

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been a while since syncing….

instead of a format like img/logos/3m-wide.png, now all are named like:
img/logos/3m/wide.png —> i.e. associated company images are named
either “square” or “wide” .png (should they be jpeg? iono…) inside of a
folder named with the comp id

additionally added some company logos from tech expo, not just iday