nvim: Add basic neorg installation

All defaults for now except for concealer installed which prettifies
the neorg files.

nvim/.config/nvim/lua/plug/_neorg.lua

@@ -0,0 +1,6 @@
+require("neorg").setup{
+    load = {
+        ["core.defaults"] = {},
+        ["core.norg.concealer"] = {}
+    }
+}

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

@@ -156,6 +156,13 @@ require("packer").startup(function()
         "folke/which-key.nvim",
         config = function() require("which-key").setup {} end
     }
+    -- extensive organization plugin mimicking orgmode
+    use {
+        "nvim-neorg/neorg",
+        config = function() require("plug._neorg") end,
+        requires = "nvim-lua/plenary.nvim",
+        tag = "*"
+    }
 
     -- fuzzy matching
     use {