update: nvim: satysfi filetype def & language server setup

dotfiles/neovim/lua/lspconfig/server_configurations/satysfi_ls.lua

@@ -0,0 +1,21 @@
+-- https://zenn.dev/monaqa/articles/2021-12-10-satysfi-language-server
+local util = require 'lspconfig.util'
+
+return {
+  default_config = {
+    cmd = { 'satysfi-language-server' },
+    filetypes = { 'satysfi' },
+    root_dir = util.root_pattern('.git'),
+    single_file_support = true,
+  },
+  docs = {
+    description = [[
+      https://github.com/monaqa/satysfi-language-server
+      Language server for SATySFi.
+      ]],
+    default_config = {
+      root_dir = [[root_pattern(".git")]],
+    },
+  },
+}
+