Move lsp config to local file structure

.config/nvim/lsp/erlangls.lua

@@ -0,0 +1,21 @@
+---@brief
+---
+--- https://erlang-ls.github.io
+---
+--- Language Server for Erlang.
+---
+--- Clone [erlang_ls](https://github.com/erlang-ls/erlang_ls)
+--- Compile the project with `make` and copy resulting binaries somewhere in your $PATH eg. `cp _build/*/bin/* ~/local/bin`
+---
+--- Installation instruction can be found [here](https://github.com/erlang-ls/erlang_ls).
+---
+--- Installation requirements:
+---     - [Erlang OTP 21+](https://github.com/erlang/otp)
+---     - [rebar3 3.9.1+](https://github.com/erlang/rebar3)
+
+---@type vim.lsp.Config
+return {
+  cmd = { 'erlang_ls' },
+  filetypes = { 'erlang' },
+  root_markers = { 'rebar.config', 'erlang.mk', '.git' },
+}