Could we improve error message when the ~/.config/emacs moved (dangling symlinks)

[FabriceSalvaire]

If we rename or move ~/.config/emacs directory, it breaks the package loading due to the use of symbolic links.
The error in Emacs is not so clear... It will complain a package file is missing...
For users, it will require some time to understand exactly what is happening: symlinks are now dangling.

It would be great if we could add a check to test if the directory doesn't exist any longer.

[raxod502]

Just to be clear, what's your directory structure? What is your user-emacs-directory, and the path to your init.el, and what path is used by your straight related directories?

Is the issue that straight.el uses absolute symlinks rather than relative ones?