feat(nvim): Add astronvim configuration

Signed-off-by: Noah Knegt <git@noahknegt.com>

.config/nvim/lua/plugins/none-ls.lua

@@ -0,0 +1,20 @@
+-- Customize None-ls sources
+
+---@type LazySpec
+return {
+  "nvimtools/none-ls.nvim",
+  opts = function(_, config)
+    -- config variable is the default configuration table for the setup function call
+    -- local null_ls = require "null-ls"
+
+    -- Check supported formatters and linters
+    -- https://github.com/nvimtools/none-ls.nvim/tree/main/lua/null-ls/builtins/formatting
+    -- https://github.com/nvimtools/none-ls.nvim/tree/main/lua/null-ls/builtins/diagnostics
+    config.sources = {
+      -- Set a formatter
+      -- null_ls.builtins.formatting.stylua,
+      -- null_ls.builtins.formatting.prettier,
+    }
+    return config -- return final config table
+  end,
+}