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.
As `C-;` cannot be used in terminals, make `C-x C-;` and `C-x ;` both
trigger the command I use the most, `help-projectile-find-file`. It's
still easy to trigger `helm-projectile` via `C-c p h`, wherein `C-c p`
is the projectile prefix.
