Remove deprecated Web IDE terminal docs
What does this MR do and why?
Remove deprecated Web IDE terminal doc references. See this issue for confusion that this is causing.
MR acceptance checklist
Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.
Screenshots or screen recordings
No visual changes since these aren't used or referenced.
How to set up and validate locally
TBD