[SDK Feature-Request] SDK example docs pages

[Erol444]

Start with the why:

A good documentation page is always critical for any API/library, this addition would nicely supplement the #956 PR. Another benefit would be that we can link some examples from docs (eg. for support), instead of linking source code.

Move to the what:

For each depthai_sdk/example add a documentation page. Add some information about the example, a demo video/image, some things to note, demos pipeline graph, its code, and link to github. So very similar to how we have Code samples docs for depthai API.

Move to the how:

Some manual work:)

[jakaskerl]

#1070