Add files managed by Kuzu page

[ray6080]

@sdht0 and @prrao87 not sure where to put this page and how to add into the nav bar. Can you take a look and give some feedback?

[prrao87]

I'll leave these corrections here, but I think this page needs a deeper discussion, as it can affect how users interact with Kuzu from the client side.

[sdht0]

Duckdb has https://duckdb.org/docs/stable/internals/storage.
We can perhaps also extract "Database internals" outside "Developer guide" and add this page there.

[prrao87]

Duckdb has https://duckdb.org/docs/stable/internals/storage.
We can perhaps also extract "Database internals" outside "Developer guide" and add this page there.

This makes sense!