nvim: Add a key binding to save files with sudo

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

nvim/.config/nvim/init.vim

@@ -186,6 +186,8 @@ set sessionoptions-=blank
 set grepprg=rg\ --vimgrep
 
 " --------------------------- Key Bindings -----------------------------------
+" Allow saving of files as sudo when I forgot to start vim using sudo
+cmap w!! w !sudo tee > /dev/null %
 " Remap escape keys to something usable on home row
 inoremap jk <Esc>
 cnoremap jk <C-C>