Added a table of contents to Hanoi post
Added a table of contents to Hanoi post

and also updated title.  Still need:

* Proper image citations etc.
* Refine subtitles?
* Proper summary.
* Final proof-read.

shwnchpl/shwnchpl.github.io,shwnchpl/shwnchpl.github.io,shwnchpl/shwnchpl.github.io