Move lsp config to local file structure

.config/nvim/lsp/buf_ls.lua

@@ -0,0 +1,17 @@
+--- @brief
+--- https://github.com/bufbuild/buf
+---
+--- buf lsp included in the cli itself
+---
+--- buf lsp is a Protobuf language server compatible with Buf modules and workspaces
+
+---@type vim.lsp.Config
+return {
+  cmd = { 'buf', 'lsp', 'serve', '--log-format=text' },
+  filetypes = { 'proto' },
+  root_markers = { 'buf.yaml', '.git' },
+  reuse_client = function(client, config)
+    -- `buf lsp serve` is meant to be used with multiple workspaces.
+    return client.name == config.name
+  end,
+}