- Moved backend determination to `config.el`
- Replaced unnecessary backquote construct with simple quotation
- Moved function from `packages.el` to `func.el`
The eglot configuration for automatically starting a server instance when
opening a file is incorrect and thus tries to start the server twice which leads
to more problems down the line. Also the company-backend is not properly setup
so auto-completion does not work reliably when using lsp or eglot.
