No navigation link for docs, no sitemap

[alirezaalavi87]

Hi.
I've recently started using logseq and I'm intrigued by it to say the least :)

Something that really caught my attention an bothered me on the website is that the docs are so hard to find, the link to the docs is on the 3rd page and you have to scroll down and pay attention to find it.
I think a link for docs should be in the navigation menu.

also at the bottom of the site, there should be a clear sitemap for easy navigation and understanding the sites structure.

I can do these and open a PR if you agree.