Fix runtime errors by removing as prop from Link

[ProchaLu]

Closes #197

Using both href and as in the Link component caused errors in the production build:

[WebServer]  ✓ Starting...
[WebServer]  ✓ Ready in 343ms
Running 1 test using 1 worker
[WebServer]  ⨯ TypeError: The "path" argument must be of type string. Received undefined
[WebServer]     at h (.next/server/chunks/984.js:1:10103)
[WebServer]     at p (.next/server/app/[contentType]/[slug]/page.js:1:6489)
[WebServer]     at f (.next/server/app/[contentType]/[slug]/page.js:1:6599) {
[WebServer]   code: 'ERR_INVALID_ARG_TYPE',
[WebServer]   digest: '1055278411'
[WebServer] }

This PR fixes the runtime errors during navigation in the production build by simplifying the Link component and removing the as prop. Since Next.js v10.0.0, href props pointing to a dynamic route are automatically resolved, making the as prop redundant.

"href props pointing to a dynamic route are automatically resolved and no longer require an as prop."

Additionally this PR Set metadataBase URL in metadata generation to remove this warning during build.

⚠ metadataBase property in metadata export is not set for resolving social open graph or twitter images, using "http://localhost:3000/". See https://nextjs.org/docs/app/api-reference/functions/generate-metadata#metadatabase

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[karlhorky]

As discussed offline:

1. This PR is probably larger than it needs to be - let's make this the smallest code change possible to fix the issue
2. Let's avoid moving away from static rendering if we can - that means either:
   1. Continuing to use generateStaticParams
   2. Using the new experimental.dynamicIO and 'use cache' APIs

[karlhorky]

LGTM, thanks!