webui2: add custom error pages

Signed-off-by: Richard Marko <rmarko@fedoraproject.org>
webui2: local js, css, fonts

Signed-off-by: Richard Marko <rmarko@fedoraproject.org>
tests: fix release version in ureport_f20 sample

Signed-off-by: Richard Marko <rmarko@fedoraproject.org>
webui2: add missing rst stuff to spec

Signed-off-by: Richard Marko <rmarko@fedoraproject.org>
bump version to 0.10

Signed-off-by: Richard Marko <rmarko@fedoraproject.org>