updating web doc for embedding viewer
minor fixes
addressing https://github.com/openmicroscopy/ome-documentation/pull/1038#issuecomment-64881852 comments
minor fixes to https://github.com/openmicroscopy/ome-documentation/pull/1038#issuecomment-65769721
adjusting warning box
addressing @will-moore comments
removing examples in favor of https://github.com/openmicroscopy/openmicroscopy/pull/3277
Merge pull request #1038 from aleksandra-tarkowska/embedding

updating web doc for embedding viewer