Adding the static files for robotic systems and errors

error page handling is currently only for page 404.html; others
restrict in no way the robotic search; crossdomain.xml means only the
restriction of cross-server site requests. robots.txt allows the
crawling of the whole site. Htaccess was taken from the html5 boiler-
plate github project: https://github.com/h5bp/html5-boilerplate
Keeping track of the last done changes:

introduced grunt and npm for formatting, building and deploying
the created web application using mostly plain html, css, a little js,
and some php wordpress includes. Therefore a little grunt server has to
run for development purposes and therefore this change gets bigger and
bigger... we will see where it ends
Giving the little scss some content...

Moreover, the grunt task 'server' is fixed, and serves now
the specified htmls, or all components are copied or build into
the 'dist' folder, and the grunt server task runs on it with all
files ready. However, development requires now the preprocessor
running the whole time on watch, otherwise it will be impossible to
recognize wrong named files or directories.