Repair interlinks in the docs

[fetsorn]

Some links were broken because next.js doesn't rewrite markdown links in html anchors. I tried to add support for it in components but didn't like the code. So i just replaced broken links with public URLs.

for context, here's the solution i dismissed. it repaired the links, but even if cleaned up it could always touch some link it shouldn't and mangle source, so i think public URLs in markdown is better direction.

// components/Markdown.js
const Link = ({node, href, children, ...props}) => {
    if (href && href.includes('.md')) {
        href = href
            .replace(/\.md(#|$)/, '/$1')
            .replace(/(^|\/)\.\.\/(?!\.)/g, '$1../../')
            .replace(/(^|\/)[0-9]*_/g, '$1');
        if (!/^(\/|\.\.\/|https?:\/\/|#)/.test(href)) {
            href = '../' + href;
        }
    }
    return <a href={href} {...props}>{children}</a>;
};