For example, currently in Theorycraft Wiki’s Arcane Mage live rotation, Auto step 3, 15, 19, and 41, and Cooldowns Up step 7 are all dimmed. What is the significance of this dimming? Should I be ignoring those steps?
Those are old/deprecated steps in the rotation that I have disabled. They are no longer in use. I leave them in there sometimes to remember why I changed it, in case questions come up.
How do you access the Theorycraft Wiki’s from the main site?
If you go to the simulator page, there is a menu that you can slide out from the left, which has a link.