The reason for this change is that CMake/vcpkg are unable to detect a
change to VCPKG_LIBRARY_LINKAGE. So when we switch to dynamic builds,
the switch would be non-functional, and every developer would have to
remove their Build and vcpkg cache directories manually. By changing
these directories, vcpkg is able to detect it must rebuild.
This change also removes parts of the existing docs that explain how to
create a .clangd file with the project-recommended defaults. (Those
docs are no longer necessary — since this change adds a .clangd file to
the repo, containing those same defaults).