misc(assets): update logo

[paulirish]

much like #9694

but updating the uses as well.

handy commands

cp assets/lighthouse-logo.svg clients/extension/images/lh_logo.svg;
cp assets/lighthouse-logo.svg treemap/app/images/lighthouse-logo.svg;
cp assets/lighthouse-logo.svg viewer/app/images/lighthouse-logo.svg;
cp assets/lighthouse-logo_512px.png viewer/app/images/lighthouse-logo_512px.png;
cp assets/lh_favicon_16px.png clients/extension/images/lh_favicon_16x16.png;
cp assets/lh_favicon_32px.png clients/extension/images/lh_favicon_32x32.png;
cp assets/lh_favicon_32px.png viewer/app/images/lh_favicon_32px.png;
cp assets/lh_favicon_76px.png viewer/app/images/lh_favicon_76px.png;

@jimoong does this look right? also want to verify you're okay with the whitespace change on the favicon? it makes it a tiny bit shorter...
though the svg seems to be bigger in its frame...

before / after:

more in situ (after):

[connorjclark]

It's very subtle, but I think the newer favicon loses some visual clarity. All the other new usages look good though.

[jimoong]

My apologies. I think I made some mistake while scaling vectors. I revised the shapes and tried not to have blurry line and removing unnecessary space on top. And for the smaller ones, I tried to increase the size of image. Original ones may look too narrow and not visible enough. Would you try with these assets again? Sorry for inconvenience.

[paulirish]

Updated before/after's