Move lsp config to local file structure

.config/nvim/lsp/lemminx.lua

@@ -0,0 +1,14 @@
+---@brief
+---
+--- https://github.com/eclipse/lemminx
+---
+--- The easiest way to install the server is to get a binary from https://github.com/redhat-developer/vscode-xml/releases and place it on your PATH.
+---
+--- NOTE to macOS users: Binaries from unidentified developers are blocked by default. If you trust the downloaded binary, run it once, cancel the prompt, then remove the binary from Gatekeeper quarantine with `xattr -d com.apple.quarantine lemminx`. It should now run without being blocked.
+
+---@type vim.lsp.Config
+return {
+  cmd = { 'lemminx' },
+  filetypes = { 'xml', 'xsd', 'xsl', 'xslt', 'svg' },
+  root_markers = { '.git' },
+}