Restore default README.md and standard .md markdown documents handling in VS Code IDE

[RandomFractals]

Steps To Reproduce

• Open any github repository code in VS Code IDE with Evidence extension enabled

Actual Behaviour

Evidence extension performs the following non-standard actions on standard .md markdown documents:

• Overwrites standard .md markdown documents handling
• Marks open README.md documents as Evidence Markdown document as noted in the VS Code status bar below
• Hides markdown document Outline
• Displays some cryptic Press / for commands... code lens as depicted below:

Expected Behavior

Consider using different filename extension for your markdown documents, such as .emd as other similar extensions (Quarto, Observable JS, MDX, etc.) do to preserve standard markdown handling in VS Code IDE without introducing new shortcuts and "slash" commands not related to normal markdown documents.

Workarounds

The only way to restore standard markdown documents handling in VS Code with the Evidence extension enabled is to change document type in the status bar where Evidence Markdown is displayed. This action is required for every .md file open, unrelated to the Evidence projects or apps and is very confusing and frustrating, including new "slash" commands and missing markdown document Outline.

[hughess]

Thanks for noting this. In advance of having a full solution to this, I've added a stopgap PR to avoid having these features show up outside of the Evidence pages directory: #128