Bug 37029: Remove 'About Koha' from intranet-main

Bug 37029: Remove 'About Koha' from intranet-main

This patch removes the 'About Koha' link as a module button, and
instead uses the 'Koha xx.xx.xx' version URL on the mainpage as a
shortcut to the 'About Koha' page.

Additionally, a link to the Koha Community website has been added to
the bottom of the 'About Koha' page, in the same place the 'Koha
xx.xx.xx' version URL appears on the mainpage.

To test:
a)  Log in to Koha's staff client
b)  Notice the 'About Koha' module button, and that the 'Koha xx.xx.xx'
    version URL goes to the Koha Community website.
c)  Notice that on the 'About Koha' page, there is no link to the Koha
    Community website.
d)  --> Apply patch <--
e)  Notice that the About Koha module button is now missing
f)  Notice that the 'Koha xx.xx.xx' version URL now goes to 'About
    Koha'
g)  Notice that on the 'About Koha' page, there is now a link for the
    Koha Community website at the bottom of the page.

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>