Updated docs cause I forgot

Author: Arthur Beck

docs/src/intro.md

@@ -2,7 +2,7 @@
 
 **Notation** is a terminal-based hierarchal note-taking app. It is also useful
 for todo lists; each item can be marked with a status. It's lightweight and
-written in ~900 lines of Rust; A release build takes slightly over a minute to
+written in ~1500 lines of Rust; A release build takes slightly over a minute to
 compile from nothing.
 
 At the moment, configuration and plugins do not exist, but in the future

docs/src/keybinds.md

@@ -9,7 +9,11 @@
 - Backspace/Left arrow - view the children of the parent note.
 - A - Add a new note.
 - E (while selecting a note) - Edit the selected note.
-- D/Delete - Delete the selected note.
+- Delete - Delete the selected note.
+- D - Duplicate the selected note. Equivalent to quickly pressing C then V.
+- C - Copy the selected note.
+- X - Cut the selected note.
+- V - Paste the selected note.
 
 ## Adding/editing mode