I've set `lexical-binding` to `nil` in all Emacs Lisp files to suppress
the warnings introduced in Emacs 31 requiring all elisp files to have a
`lexical-binding` comment.
This retains the default behavior of dynamic binding when no
`lexical-binding` comment is present. With it set to `t` across the
board, various things break, and fixing those is a task for another day.
Enable polymode within code-blocks in Markdown files. Effectively, it
allows code-blocks of various languages to be handled by their
respective major modes, allowing correct syntax highlighting, snippets,
and other features to work as you would expect.
