Rename this repository.

[ksolive]

Due to the new components required by 'alpenhorn' and 'vuvuzela', which depend on this repository, necessitating the usage of Go versions 1.13 or higher, these new Go versions demand that the import paths cannot contain "internal". As a result, 'alpenhorn' and 'vuvuzela' are currently unable to compile correctly. It is suggested to rename this repository to 'foo', which aligns with the advice of the majority of Go programmers.