minor tweaks to site header for a11y

[juruwolfe]

What's in this pull request

At the request of our accessibility experts, made a couple minor tweaks to the header. Added a destination to the logo (easy) and then added the skip link. For that one to work as intended, we'll need a minor change to the bluprint where our <main> tag has an id of #main-content

[changeset-bot]

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Latest commit: d21cd1d

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[hobbes7878]

Added a PR in #182 that adds the id to the main tag in Article component (and also cleared out the yarn.lock file (I switched this repo to npm a bit ago)).

Otherwise, just needs a changeset on the PR to make a new version. Can make one by running: npx changeset add. This would be a patch update, I think.