chore: Added null-ls plugin.This enables certain tools to act as LSPs

(formatters, linters, etc)

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

@@ -0,0 +1,10 @@
+local null_ls = require("null-ls")
+
+null_ls.setup({
+	sources = {
+		null_ls.builtins.formatting.rustfmt,
+		null_ls.builtins.formatting.prettierd.with({
+			filetypes = { "html", "json", "yaml", "markdown" },
+		}),
+	}
+})