to update wikik page: layer

Hi I would like to update the above page since it is a bit outdated, my plan is

Proposal A
to change it by re-constructing:

  1. the layer concept of synfig, what’s differences between synfig and other graphics applications
  2. the categories of the layers available, geometry for an example.
  3. list out all layers of synfig and in the same way as synfig studio gui (layer menu)
  4. link each layer to its own page. Luma page for example, it will be linked to

Proposal B
to just re-direct this layer page to

what do you think?

I prefer strategy A. But do not make it so long (like it is now) when the article is so long, better split it into multiple pages.