Refactored lsp and null ls configs

after/plugin/lsp/mason.lua

@@ -0,0 +1,35 @@
+local mason_status, mason = pcall(require, "mason")
+if not mason_status then
+  return
+end
+
+local mason_lspconfig_status, mason_lspconfig = pcall(require, "mason-lspconfig")
+if not mason_lspconfig_status then
+  return
+end
+
+local mason_null_ls_status, mason_null_ls = pcall(require, "mason-null-ls")
+if not mason_null_ls_status then
+  return
+end
+
+mason.setup()
+
+mason_lspconfig.setup({
+  ensure_installed = {
+    "tsserver",
+    "html",
+    "cssls",
+    "lua_ls"
+  },
+  automatic_installation = true,
+})
+
+mason_null_ls.setup({
+  ensure_installed = {
+    "stylua",
+    "clang_format",
+    "eslint_d"
+  },
+  automatic_installation = true,
+})