[Website] Sample entry boxes are not listed as a dedicated registration type

[podborski]

Summary

Here we should also see Sample Entry Boxes

In addition to that when using a search field the sample entry boxes are listed as codecs. E.g.:

Steps to reproduce

Open the website, hover over Regisered Types

[cconcolato]

Initially we did not want to register them because the boxes in the sample entry of a proprietary codec do not risk 4CC collision, but I agree it's better to have them.

[podborski]

yep, especially when we define boxes in the abstract VisualSampleEntry container that is codec-independent.