nvim: init.vim: Drop tmux-complete

This does not work anymore. Probably because we dropped python and it
also does not list a source for completion-nvim. However, we can copy
anything from tmux using tmux extracto plugin to the clipboard, so
that is also a solution.

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

nvim/.config/nvim/init.vim

@@ -17,7 +17,6 @@ Plug 'nvim-lua/completion-nvim'
 Plug 'steelsojka/completion-buffers'
 " For tmux
 Plug 'tmux-plugins/vim-tmux-focus-events'
-Plug 'wellle/tmux-complete.vim'
 " Git support
 Plug 'rhysd/git-messenger.vim'
 Plug 'tpope/vim-fugitive'