Remove mention of nickel interpreter from nls readme
# Nickel Language Server
-NLS is a language server for the nickel programming language. Making use of the interpreter libraries directly, allows nls to offer error messages, type hints, and autocompletion right in your favorite lsp-enabled editor.
+NLS is a language server for the nickel programming language. NLS offer error messages, type hints, and auto-completion right in your favorite LSP-enabled editor.
## Server
