nvim: after: plugin/ftplugin: Drop unnecessary maps

Fugitive/vim already provides the necessary mappings. No need for
mapping these.

nvim/.config/nvim/after/ftplugin/diff.vim

@@ -1,3 +0,0 @@
-" Jump to sections of diff
-nmap <buffer> [c ?^@@<CR>
-nmap <buffer> ]c /^@@<CR>

nvim/.config/nvim/after/plugin/fugitive.vim

@@ -21,7 +21,3 @@ nnoremap <Leader>g+ :Git stash pop<CR>:e<CR>
 nnoremap <Leader>gs :Git<CR>
 nnoremap <Leader>gS :Git<SPACE>
 nnoremap <Leader>gw :Gwrite<CR>
-
-" For 3 way merge
-nnoremap <Leader>dl :diffget //2<CR>
-nnoremap <Leader>dr :diffget //3<CR>