bundles documentation points to non-existing page

[chhtz]

On this page
https://github.com/rock-core/rock-core.github.io/blob/master/documentation/setting_up_a_project/300_bundles.md
there is a link to this page:
http://rock.opendfki.de/wiki/WikiStart/Standards/RG7
which does not seem to exist anymore (at least not at that URL)

[moooeeeep]

This domain occurs in more places:

documentation/contributing/index.md:pages [on the Rock trac](http://rock.opendfki.de) or [update the Rock reference
documentation/contributing/packages.md:guidelines](http://rock.opendfki.de/wiki/WikiStart/Standards/RG4)). Even the
documentation/setting_up_a_project/300_bundles.md:See [the wiki](http://rock.opendfki.de/wiki/WikiStart/Standards/RG7) for more
documentation/system_management_tutorials/100_moving_to_bundles.md:See [this page](http://rock.opendfki.de/wiki/WikiStart/Standards/RG7) for more
documentation/base_types.md:[wiki](http://rock.opendfki.de/wiki/WikiStart/Toolchain/EigenTypes) page on the
documentation/packages/index.md:packages](http://rock.opendfki.de/wiki/WikiStart/Standards/RG4)
documentation/packages/index.md:on the [Rock guidelines on Ruby packages](http://rock.opendfki.de/wiki/WikiStart/Standards/RG5).
documentation/packages/cmake_macros.md:[the Rock guidelines](http://rock.opendfki.de/wiki/WikiStart/Standards/RG4) for
documentation/tutorials/100_basics_create_library.md:of Rock conform to this style. See [these guidelines](http://rock.opendfki.de/wiki/WikiStart/Standards/RG4)