Resolved annoying 'css-unused-selector' warning messages

[EthanThatOneKid]

• Deleted theme.scss file
• Added size variables to global.css
• Replaced RFS library with CSS calc()-ulations in global.css
• Removed gfm.css (GitHub Flavored Markdown) CSS library

Resolves #332.

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[ghost]

rfs package doesn't resize some headers to become smaller on mobile breakpoint like before, but tbh i kinda like it. approved

[EthanThatOneKid]

rfs package doesn't resize some headers to become smaller on mobile breakpoint like before, but tbh i kinda like it. approved

I added the RFS-generated values to our global.css since we don't need to recalculate them.

acmcsuf.com/static/global.css

Lines 115 to 123 in 2bbd0da

	@media screen and (max-width: 1000px) {
	:root {
	--size-xl: calc(1.425rem + 2.1vw);
	--size-lg: calc(1.35rem + 1.2vw);
	--size-md: calc(1.275rem + 0.3vw);
	--size-sm: calc(1.175rem + 0.1vw);
	--size-xs: calc(1.075rem + 0.05vw);
	}
	}

Updated Screenshot

[ghost]

Join button text should be a big larger for desktop

Hover on join button is different now. The background color should be changing to acmBlue, not the text color.