[nvim] add mason to help install external tool dependencies

config/nvim/lua/plugins/lsp.lua

@@ -92,6 +92,7 @@ return {
 			} },
 			{ "yamlls" },
 			{ "cssls" },
+			{ "lua_ls" },
 		}
 
 		for _, server in pairs(servers) do

config/nvim/lua/plugins/mason.lua

@@ -0,0 +1,8 @@
+return {
+	"williamboman/mason.nvim",
+	opts = {
+		ui = {
+			border = "single",
+		},
+	},
+}

config/nvim/lua/plugins/null-ls.lua

@@ -154,12 +154,6 @@ return {
 				}),
 
 				-- global commands
-				null_ls.builtins.formatting.stylua.with({
-					condition = function()
-						return utils.is_executable("stylua")
-					end,
-				}),
-
 				null_ls.builtins.diagnostics.erb_lint.with({
 					condition = function()
 						return utils.is_executable("erblint")
@@ -240,6 +234,11 @@ return {
 						return utils.is_executable("luacheck")
 					end,
 				}),
+				null_ls.builtins.formatting.stylua.with({
+					condition = function()
+						return utils.is_executable("stylua")
+					end,
+				}),
 
 				null_ls.builtins.diagnostics.markdownlint.with({
 					condition = function()