docs remove README duplication via symlink

[structwafel]

Made ./static-serve/README.md a symlink, such that in crates.io the readme is consistent with the workspace readme.

This is something atuin also does:

setting up a "relative" readme in cargo is possible, however then the #![doc.. relative path doesn't work anymore.

[package]
name = "static-serve"
readme = "../README.md"  #  <-- work but no #![doc support

[paolobarbolini]

Suddenly axum decided to go do something else 😆

[structwafel]

I was today years old where I learned that it will run all readme code if you include it in the docs.

The old readme also just ignored it, So doing the same here.

[ThinkerDreamer]

Hey @structwafel , thanks! Looks good. We can squash these into one commit with docs: at the beginning.

[structwafel]

Done! @ThinkerDreamer
Need to step up my git game 3