chore(nvim): Fully migrated to lua!

Closes GH-5

.config/nvim/lua/null/config.lua

@@ -3,14 +3,22 @@ local g = vim.g
 
 o.encoding = "utf-8"
 o.hls = true
-o.nu = true
+
+o.number = true
 o.relativenumber = true
+o.cursorline = true
+o.cursorlineopt = "number"
+
 o.ignorecase = true
 o.smartcase = true
 o.mouse = "a"
 o.splitbelow = true
 o.splitright = true
 
+-- Remove ugly tilde at the end of a file
+-- REF: https://vi.stackexchange.com/a/29181
+o.fillchars = "eob: "
+
 g.mapleader = " "
 g.guifont = { "Sarasa UI J", ":h16" }