Rem lock and document lock

✨ What new feature or change would you like to see added in RemNote?

Rem lock and document lock, which make a rem or a doc be in view-only mode.

🤔 What problem does it solve for you? How would it improve your workflow or experience with RemNote?

Sometimes, with a trunk of code, especially with RegEx (regular expression), the code trunk should not be altered accidentally at all. And even commonly, when a piece of note is concluded, it should not be changed.

🚀 Are there any examples of this suggestion implemented in other apps (if applicable)?

Notion has page lock.