nixpkgs/neovim: use telescope in favor of merginal

.config/nixpkgs/neovim/flake.nix

@@ -44,7 +44,6 @@
               vim-surround
               vim-abolish
               undotree
-              vim-merginal
               telescope-nvim
               telescope-fzf-native-nvim
               mini-nvim

.config/nixpkgs/neovim/mappings.lua

@@ -26,7 +26,7 @@ vim.keymap.set('n', '<Leader>c', '<cmd>set cursorline! cursorcolumn!<CR>', opts)
 
 -- git
 vim.keymap.set('n', '<Leader>gs', '<cmd>Git<CR>', opts)
-vim.keymap.set('n', '<Leader>gb', '<cmd>Merginal<CR>', opts)
+vim.keymap.set('n', '<Leader>gb', '<cmd>Telescope git_branches<CR>', opts)
 
 -- undotree
 vim.keymap.set('n', '<Leader>ut', '<cmd>UndotreeToggle<CR>', opts)