[Web] Consolidating download locations

[Sze Howe Koh]

Hello,

There are multiple download locations, some more maintained than
others. There are also versions of Qt stuck in limbo (more below).
This caused a user to think that releases have stagnated
(http://qt-project.org/forums/viewthread/30266), and others to fail at
finding Qt 4.8.1 (http://qt-project.org/forums/viewthread/30193,
http://qt-project.org/forums/viewthread/30217/)

These seem unmaintained:
    http://origin.releases.qt-project.org/qt4/source/ -- Latest is Qt
4.8.4 (source only)
    http://origin.releases.qt-project.org/qt5/ -- Latest is Qt 5.0.1
    http://origin.releases.qt-project.org/qtcreator/ -- Latest is Qt
Creator 2.7.0

The preferred place to store/get releases seems to be in subdirectories of:
    http://qt-project.org/downloads

...but not all pages can be reached by normal means. To get Qt 4.8.0
-- 4.8.4, one needs to go to:
    http://download.qt-project.org/official_releases/qt/4.8/

...but this page can't be reached through links alone from
    http://qt-project.org/downloads

I presume that, under the current scheme, users will be unable to find
Qt 5.1.0 when 5.1.1 is released. It would be good to tidy up the
download tree.


Regards,
Sze-Howe