Makefile enhancements

[zklinger]

The Motivation

To make building the parser for generating documentation for telescope.nvim on a local machine a touch simpler.

Currently there are some manual steps required to set up the parser directory before generating the parser and later copying/sym linking the parser.so to the parser directory.

This PR is trying to streamline that.

The Changes

• make node tree-sitter a build dependency and install it if it's not installed yet
• create the parser directory if it does not exist yet
• after building the parser, copy the generated parser.so to the parser/lua.so

Notes

I have removed the following lines from the Makefile

ifeq (, ${ts})
    ts := $(shell which tree-sitter 2> /dev/null)
endif

ifeq (, ${ts})
    ts := $(shell which tree-sitter-cli 2> /dev/null)
endif

as the above conditionals always evaluate to false because ${ts} is never empty (it has been set to "./node_modules/tree-sitter-cli/tree-sitter" on line 1).