Adds installation instructions to landing page
Adds installation instructions to landing page

wavebeem/website-squiggle,wavebeem/website-squiggle,squiggle-lang/squiggle-lang.org,squiggle-lang/squiggle-lang.org,squiggle-lang/squiggle-lang.org,squiggle-lang/squiggle-lang.org,wavebeem/website-squiggle,wavebeem/website-squiggle