Move lsp config to local file structure

.config/nvim/lsp/slangd.lua

@@ -0,0 +1,31 @@
+---@brief
+---
+--- https://github.com/shader-slang/slang
+---
+--- The `slangd` binary can be downloaded as part of [slang releases](https://github.com/shader-slang/slang/releases) or
+--- by [building `slang` from source](https://github.com/shader-slang/slang/blob/master/docs/building.md).
+---
+--- The server can be configured by passing a "settings" object to vim.lsp.config('slangd'):
+---
+--- ```lua
+--- vim.lsp.config('slangd', {
+---   settings = {
+---     slang = {
+---       predefinedMacros = {"MY_VALUE_MACRO=1"},
+---       inlayHints = {
+---         deducedTypes = true,
+---         parameterNames = true,
+---       }
+---     }
+---   }
+--- })
+--- ```
+--- Available options are documented [here](https://github.com/shader-slang/slang-vscode-extension/tree/main?tab=readme-ov-file#configurations)
+--- or in more detail [here](https://github.com/shader-slang/slang-vscode-extension/blob/main/package.json#L70).
+
+---@type vim.lsp.Config
+return {
+  cmd = { 'slangd' },
+  filetypes = { 'hlsl', 'shaderslang' },
+  root_markers = { '.git' },
+}