(Sorry, this is a particularly pedantic issue)
The name of this repository is "ghdl-language-server" which strongly suggests that it contains the ghdl language server. However instead, it actually contains language server clients for VS code and emacs.
Additionally, all sections of README.md up to section "Visual Studio Code (VSC) Extension" are not relevant to this repository because they refer to the language server, which is not hosted in this repository.