Fix indentations, tabs, spaces, etc.

Now the default is tab width of 4 spaces, and no tabs but spaces for tabs.
"bing" and "bong" alternately rings at 1 sec interval
Working timer on page.

Currently set to 10 second periodicity, with the 'distraction' time
of 2 seconds.
Published with https://stackedit.io/
Published with https://stackedit.io/
Published with https://stackedit.io/
refactor code