feat(styles/dracula): use official green and red for inserted and deleted
feat(styles/dracula): use official green and red for inserted and deleted

Green and red are the de facto colors used to represent inserted and
deleted lines. This changes the red that was already used for deleted to
use the official Dracula red, getting rid of an unofficial color, and
changes the inserted color from foreground white to green, to make
insertions stand out from headings and such.

alecthomas/chroma,alecthomas/chroma,alecthomas/chroma,alecthomas/chroma