Nev v0.2.1

Fixed some bugs, more docs, more vscode keybindings

Notes:

• The gui version is called astg/ast-gui, the terminal version ast. Both are dynamically linked
• If you run into errors with glibc versions you have to compile the editor yourself for now, or use ast-musl which is statically linked

Full Changelog: v0.2.0...v0.2.1