nvim: init.vim: Modify key bindings as recommended by plugin docs

Signed-off-by: Sanchayan Maity <maitysanchayan@gmail.com>

nvim/init.vim

@@ -518,3 +518,17 @@ function! FloatingSkim()
 
   call nvim_open_win(buf, v:true, opts)
 endfunction
+
+function! NvimGdbNoTKeymaps()
+  tnoremap <silent> <buffer> <esc> <c-\><c-n>
+endfunction
+
+let g:nvimgdb_config_override = {
+  \ 'key_next': 'n',
+  \ 'key_step': 's',
+  \ 'key_finish': 'f',
+  \ 'key_continue': 'c',
+  \ 'key_until': 'u',
+  \ 'key_breakpoint': 'b',
+  \ 'set_tkeymaps': "NvimGdbNoTKeymaps",
+  \ }