Change helm-delays to 0.01 s

- Replace constructs

    (when (try-require 'some-package) ...

  with

    (try-require 'some-package)
    (with-eval-after-load "some-package" ...

- Bind <f1> to new "describe symbol at point" function (only works for Emacs
  Lisp, in the current state of affairs)