Cpp: Remove C++ links which are no longer available

No alternative or replacement links exist at present,
therefore removing them entirely.
Merge pull request #616 from rleigh-dundee/cpp-link-removal-dev44

Cpp: Remove C++ links which are no longer available
Tidying webclient plugin page
Merge pull request #624 from hflynn/webplugin_tidy

Tidying webclient plugin page