Add more pager to my top todotxt actions

@computer is my most used context, so I'll need to wrap it in a MORE pager so i
can view these
Add alias to access ledger3

Need to define $LEDGER_FILE, which I put into my ~/.localrc
Add alias to switch directories

Use d as dirs -v.  Can switch to prev dirs using cd -<NUM>
Add git send-email gmail auth to gitconfig

Updated the gitconfig.symlink.example and bootstrap file to replace the
variables.  I stored my SMTP username and password in my ~/.localrc file so
I'll have to check that these variables are set before allowing the bootstrap
to run.  The echo message is just to remind me to source the file