refactor: clean up file tree, remove redundant code, formatting

.config/nvim/lua/core/options.lua

@@ -22,14 +22,6 @@ o.number = true
 o.relativenumber = true
 --  ──────────────────────────────────────────────────── sign column ──
 o.signcolumn = 'yes'
---  ─────────────────────────────────────────────────────── markdown ──
-vim.api.nvim_create_autocmd('BufWinEnter', {
-   pattern = { '*.md' },
-   callback = function()
-      o.colorcolumn = '+1,+2'
-      o.textwidth = 80
-   end,
-})
 --  ──────────────────────────────────────────────────── cursor line ──
 o.cursorline = true
 -- o.scrolloff = 999 -- keep cursor line centered
@@ -95,4 +87,4 @@ o.ignorecase = true
 o.smartcase = true
 o.iskeyword:append('-') -- consider string-string as a whole word
 --  ───────────────────────────────────────────────────── completion ──
-o.completeopt = 'menu,preview,noselect'
+o.completeopt = 'menu,preview,noselect'