Minimize the flycheck rules when using org-mode's edit functionality for
source code blocks (e.g. `#+begin_src emacs-lisp / #+end_src`) that pops
up a new buffer with the minor mode `'org-src-mode`.
Adapted from Janfel's snippet in Wilfred/helpful#250.
And bound to C-{o,i} and {<,>} for evil users, and C-c C-{b,f} and {l,r}
for vanilla users (mirroring the back/forward keybinds for help.el).
Ref: Wilfred/helpful#250
