add reusable ExtensionLinks component, use on /install page

[sidvishnoi]

• Replace the extension links on /install page and /supporters/get-started with a reusable component
  • Minor UI change, but I moved GitHub link into same line as other icons. To keep it simple.
  • Added shadow styles same as /supporters/get-started page.
• The component has a utm prop, so we can track from where user came to the extension from within website, and as a general marketing campaign.
  • Ideally, we want to pass /install page's UTM params (assuming the page stays) to the component, but not possible with static builds without JS.
• Replace github-icon.svg with a square one (earlier one as 98x96).

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[w3cbot]

sidvishnoi marked as non substantive for IPR from ash-nazg.