Move lsp config to local file structure

.config/nvim/lsp/vhdl_ls.lua

@@ -0,0 +1,38 @@
+---@brief
+---
+--- Install vhdl_ls from https://github.com/VHDL-LS/rust_hdl and add it to path
+---
+--- Configuration
+---
+--- The language server needs to know your library mapping to perform full analysis of the code. For this it uses a configuration file in the TOML format named vhdl_ls.toml.
+---
+--- vhdl_ls will load configuration files in the following order of priority (first to last):
+---
+---     A file named .vhdl_ls.toml in the user home folder.
+---     A file name from the VHDL_LS_CONFIG environment variable.
+---     A file named vhdl_ls.toml in the workspace root.
+---
+--- Settings in a later files overwrites those from previously loaded files.
+---
+--- Example vhdl_ls.toml
+--- ```
+--- # File names are either absolute or relative to the parent folder of the vhdl_ls.toml file
+--- [libraries]
+--- lib2.files = [
+---   'pkg2.vhd',
+--- ]
+--- lib1.files = [
+---   'pkg1.vhd',
+---   'tb_ent.vhd'
+--- ]
+--- ```
+
+---@type vim.lsp.Config
+return {
+  cmd = { 'vhdl_ls' },
+  filetypes = { 'vhd', 'vhdl' },
+  root_markers = {
+    'vhdl_ls.toml',
+    '.vhdl_ls.toml',
+  },
+}