feat: custom sets and VimBeGood

- added custom sets for line numbers (absolute in Insert, relative in Normal)
- added VimBeGood plugin

lua/custom/set.lua

@@ -0,0 +1,12 @@
+vim.opt.relativenumber = true
+vim.opt.scrolloff = 8
+
+vim.opt.colorcolumn = "80"
+
+vim.api.nvim_exec([[
+	augroup numbertoggle
+		autocmd!
+		autocmd InsertEnter * set norelativenumber
+		autocmd InsertLeave * set relativenumber
+	augroup END
+]], false)