nvim: add job limit for packer.nvim

.config/nvim/lua/blake/plugins.lua

@@ -532,6 +532,8 @@ config = {
    compile_path = vim.fn.stdpath('config')..'/lua/packer_compiled.lua',
    -- Don't ask before removing plugins
    autoremove = true,
+   -- Limit max jobs to avoid getting killed on low-end hardware
+   max_jobs = 50,
 }})
 
 -- how to align all plugin descriptions: select all plugins in visual line, :'<,'>Align \(.\+use { -- .\+: \+\)\@<=[^ ][^:]\+$