Add vim keybindings

Add binding for the substitute command.
Add bindings for interacting with the system clipboard with y/p.
Change the keybindings header to use the full word.

.config/vim/vimrc

@@ -43,7 +43,7 @@ else
 	nmap cW dWi
 endif
 
-" Keybinds #####################################################################
+" Keybindings ##################################################################
 " Set leader key
 let mapleader = "\<Space>"
 " Stop highlighting search result when pressing Return
@@ -60,6 +60,27 @@ nnoremap <leader>j <C-w><C-j>
 nnoremap <leader>k <C-w><C-k>
 nnoremap <leader>l <C-w><C-l>
 
+" Substitute command
+if (exists('+inccommand') && &inccommand != '')
+	nnoremap S :%s/
+else
+	" This does not work with live previewing commands (inccommand) since the
+	" replace pattern is already defined and thus everything matching the search
+	" pattern is just deleted.
+	nnoremap S :%s//gc<Left><Left><Left>
+endif
+
+" Interact with the system clipboard
+if (has('clipboard') || has('nvim'))
+	nnoremap <leader>y "+y
+	nnoremap <leader>p "+p
+	nnoremap <leader>P "+P
+
+	vnoremap <leader>y "+y
+	vnoremap <leader>p "+p
+	vnoremap <leader>P "+P
+endif
+
 " Aesthetics ###################################################################
 " Use 24-bit (true-color) mode
 if (has('termguicolors'))