Remove the Cursor Context tab

[tatomyr]

After adding typehints to the VSCE, the Cursor Context doesn't provide much value to our users (it may even confuse them because it's not even clear what its purpose is).
The plan is to:

• Add a deprecation warning with links to this issue and the typehint article to collect user feedback if any.
• Remove/hide the tab before releasing V1.
• Remove all mentions of Cursor Context from the docs.