Use svg or smaller image for logo

[duanwilliam]

basically same issue as acmucsd/membership-portal-ui#525

we are currently serving a ~880kb, 2550x2550 png image for our logo in the top left (https://github.com/acmucsd/main-website/blob/master/src/assets/ACMWhiteLogo.png)

this image is displayed at a size of 60x60 (also, will just note that this is different from membership portal - dunno if we want consistency between them but yuh)

main-website/src/components/NavigationBar/style.less

Lines 37 to 40 in 1073c88

	> img {
	height: 60px;
	margin: 0;
	}

we can save nearly 1mb data by serving an svg instead, or a scaled down image.