Base Layer explanation and adding user's intention

[LuniMoon]

I noticed that the small (but important) notion of "keeping objects on the base layer" disappeared. So, I added it back.

I also changed some words to match user's search and reading intention: following an object vs moving an object, camera vs layer (I changed the word "layers" for "objects" because even if it's technically correct, the intention of the reader is on an object, not on a layer).

I "deprioritised" the use of other extensions like "copy camera settings", but I still included it under the "follow smoothly" section.