Document: build CMS from scratch

The existing documentation on http://www.onehippo.org/cms7/documentation/development/core/building/maven.html is outdated / will get outdated

We already have something on the wiki: https://wiki.onehippo.com/display/CMS7/Building+Hippo+CMS+7.5+from+scratch

The Eclipse and Netbeans is probably also obsolete. Also update or unpublish.
Note that the references to (old) quickstart is invalid. Should point to the new quickstart (hst demo)

update documentation links to svn.onehippo.org

Also CMS7-4791 - Renaming of svn hippo-cms7/hippoecm folder to hippo-cm7/archive