nvim: remove vim-lumen (slow and I don't really ever use light theme)

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

@@ -94,9 +94,6 @@ return require('packer').startup({function()
          vim.cmd 'cab COL ColorizerToggle'
       end,
    }
-   use { -- lumen:                     make vim respect the system light/dark theme setting (linux + macos)
-      'vimpostor/vim-lumen',
-   }
    use { -- vim-illuminate:            highlight other occurrences of the word under cursor
       'RRethy/vim-illuminate',
       -- commit = '27f6ef135a88d9410a33cf92fc47f5c018df552c', -- for finding the correct color to make highlights