Document activites and home/dotsugar

Missing from the basic documentation on using the dev-environment was
an explanation of sugar-build/activities and
sugar-build/home/dotsugar. This patch provides some basic
documentation for these essential subdirs. Also, the link to
dev-environment.md was broken in activity.md. A patch to fix it also
included.
Add documentation for gconf directory

It would be good to point new developers to
sugar-build/home/default/config/gconf as part of the introduction to
the dev environment. Also, removed some stray .s
Fix line length
Couple of nitpicks
How to run this docs locally
Add information about RECESS
Explanation for installing external JS libs with volo
Instruction to run multiple instances of sugar-build
Cosmetic improvement
add "non-AMD libs" section with a reference to RequiresJS configuration

http://lists.sugarlabs.org/archive/sugar-devel/2013-November/045480.html
Fixes broken anchor link to "non-AMD libs" header
Helpful tips
I added how to track progress of pull, and what to do when having problems
dev-environment: correct JSON in prefs.json github example
Add sugarlabs brand
Remove broot setup slowness comment

We now have a progress bar.
Added a page to help new developers find stuff to do
adding some NLs
Fixed links turning into plain text in what-can-i-do
Way to create from Sugarizer instead of osbuild
Fix the sugar-web link in activity.md