docs/144515: [handbook] Expand handbook Table of contents

[Gabor Kovesdan]

On 2014.01.23. 16:59, Thomas Hoffmann wrote:
> I agree, the TOC is already too long vertically. Adding subsections 
> would exacerbate the problem.
>
> By "horizontal page" I mean taking advantage of the full screen width, 
> for example, by using multi-columns or similar technique. That would 
> get more info on each screen page. Compare the TOC with the 
> x-config.html page ( 
> http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/x-config.html), 
> which uses the full page width.
The problem with this is that TOC is a multiple level enumeration by 
nature, which is conventionally listed vertically in order. Using two 
columns may be confusing for people since it is not conventional. And if 
we use 2 columns, what order would it follow? Like this:

1        2
1.1    2.1
1.2    2.2
1.3    2.3

Or this:

1
1.1        1.2
1.3        1.4

And what to do on smaller screens if the two columns do not fit?

I believe that a collapsible tree list would be the best option but that 
requires JavaScript, which we prefer to avoid...

Gabor