set canonical tag for each page to point to the current url

[parasquid]

right now it's hardcoded as <link href="https://hivekind.com/" rel="canonical" /> in the layout.tsx

[parasquid]

https://nextjs.org/docs/app/api-reference/functions/generate-metadata#generatemetadata-function might be something we need use (currently we set the seo meta tags here, we should be able to generate canonical tags too)