Analytics, SEO, logo and auth

Very successful Saturday, lookup.design now has analytics thanks to plausible (they're also public at https://plausible.io/lookup.design), I did a bit of work on the design and added a footer and nav to make it look like an actual website, settled on a logo for now and took care of the bare minimum for SEO (meta tags). Pretty happy about the progress so far and on track to have a presentable mvp for hn/product hunt etc. next week.