[Ur] Various Ur/Web examples online

[Sergey Mironov]

Hi. I have repaired my old site containing various Ur/Web examples. It
should be accessible as

http://sthdwp.com/HomePage/main

The site demonstrate not only Ur/Web libraries, but also the
`urweb-build' build system which  handles dependencies including urweb
compiler and backend databases and may build hierarchical projects
(note the sources at https://github.com/grwlf/urweb-homepage).

Regards,
Sergey