vimrc: Add shortcut to unindent with Shift-Tab

.profile

@@ -2,8 +2,8 @@
 # ~/.profile -- Included by .bash_profile; includes ~/.profile.local
 #
 
-# SSH key agent is started by systemd user
-#export SSH_AUTH_SOCK="$XDG_RUNTIME_DIR/ssh-agent.sock"
+# SSH key agent
+[[ -e "$XDG_RUNTIME_DIR/gcr/ssh" ]] && export SSH_AUTH_SOCK="$XDG_RUNTIME_DIR/gcr/ssh"
 
 # GPG key stuff
 export GPG_TTY=$(tty)

.vimrc

@@ -139,6 +139,9 @@ inoremap <A-j> <C-o>j
 inoremap <A-k> <C-o>k
 inoremap <A-l> <C-o>l
 
+" Unindent with Shift-Tab
+inoremap <S-Tab> <C-o><<
+
 " Copy and to X clipboard (Ctrl-C in visual mode and Ctrl-V in insert mode)
 vmap <C-C> "+y
 imap <C-V> <C-\><C-O>"+P