Move lsp config to local file structure

.config/nvim/lsp/djls.lua

@@ -0,0 +1,12 @@
+---@brief
+---
+--- https://github.com/joshuadavidthomas/django-language-server
+---
+--- `djls`, a language server for the Django web framework.
+
+---@type vim.lsp.Config
+return {
+  cmd = { 'djls', 'serve' },
+  filetypes = { 'htmldjango', 'html', 'python' },
+  root_markers = { 'manage.py', 'pyproject.toml', '.git' },
+}