Nvim restart (#9)

* chore(nvim): remove astronvim and configs

* feat(nvim): new, custom nvim configuration

config/nvim/lua/plugins/smartcolumn.lua

@@ -0,0 +1,7 @@
+return {
+  "m4xshen/smartcolumn.nvim",
+  opts = {
+    colorcolumn = { "80", "100", "120" },
+    disabled_filetypes = { "help", "text", "markdown", "json", "lazy", "starter", "neo-tree" },
+  },
+}