clean up legacy files

legacy/ftplugin/markdown.vim

@@ -0,0 +1,20 @@
+setlocal spell
+
+" markdown : jump to next heading
+" https://gist.github.com/romainl/ac63e108c3d11084be62b3c04156c263
+function! s:JumpToNextHeading(direction, count)
+    let col = col(".")
+
+    silent execute a:direction == "up" ? '?^#' : '/^#'
+
+    if a:count > 1
+        silent execute "normal! " . repeat("n", a:direction == "up" && col != 1 ? a:count : a:count - 1)
+    endif
+
+    silent execute "normal! " . col . "|"
+
+    unlet col
+endfunction
+
+nnoremap <buffer> <silent> ]] :<C-u>call <SID>JumpToNextHeading("down", v:count1)<CR>
+nnoremap <buffer> <silent> [[ :<C-u>call <SID>JumpToNextHeading("up", v:count1)<CR>