Move lsp config to local file structure

.config/nvim/lsp/visualforce_ls.lua

@@ -0,0 +1,31 @@
+---@brief
+---
+--- https://github.com/forcedotcom/salesforcedx-vscode
+---
+--- Language server for Visualforce.
+---
+--- For manual installation, download the .vsix archive file from the
+--- [forcedotcom/salesforcedx-vscode](https://github.com/forcedotcom/salesforcedx-vscode)
+--- GitHub releases. Then, configure `cmd` to run the Node script at the unpacked location:
+---
+--- ```lua
+--- vim.lsp.config('visualforce_ls', {
+---   cmd = {
+---     'node',
+---     '/path/to/unpacked/archive/extension/node_modules/@salesforce/salesforcedx-visualforce-language-server/out/src/visualforceServer.js',
+---     '--stdio'
+---   }
+--- })
+--- ```
+
+---@type vim.lsp.Config
+return {
+  filetypes = { 'visualforce' },
+  root_markers = { 'sfdx-project.json' },
+  init_options = {
+    embeddedLanguages = {
+      css = true,
+      javascript = true,
+    },
+  },
+}