reduce max job size for packer

nvim/lua/plugins.lua

@@ -42,6 +42,7 @@ return require('packer').startup({
     use 'sirtaj/vim-openscad'
   end,
   config = {
-    clone_timeout = 99999
+    clone_timeout = false,
+    max_jobs = 2 -- otherwise PackerUpdate dies on shitty hardware like the pi zero
   }
 })