Convert from HTML to MOBi with Calibre

It's important to change the extension from txt to HTML before importing to Calibre. Otherwise the conversion will take forever.

Before doing so, insert proper html tag so that it can be view correctly by browsers. 

Add <h2> to all chapers

Add <h1> to title

Add <br/> to each line

Add html head, body etc.

Then convert to mobi with calibre and put 

//h:h1

//h:h2

as level 1 and level 2 TOC correspondingly in the table of content section.

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Feng