Move lsp config to local file structure

.config/nvim/lsp/tilt_ls.lua

@@ -0,0 +1,18 @@
+---@brief
+---
+--- https://github.com/tilt-dev/tilt
+---
+--- Tilt language server.
+---
+--- You might need to add filetype detection manually:
+---
+--- ```vim
+--- autocmd BufRead Tiltfile setf=tiltfile
+--- ```
+
+---@type vim.lsp.Config
+return {
+  cmd = { 'tilt', 'lsp', 'start' },
+  filetypes = { 'tiltfile' },
+  root_markers = { '.git' },
+}